I am one of those few, but mad, people with a Dream/G1, that has the SIM-problem where the phone claims that "your SIM doesn´t allow connection to this network" etc.
In my research to why this problem exists, I have seemed to trace it back to when the 1.5 version was released OTA. The operator functioning with the phone when the OTA update was installed will still funtion, but the other operators will sometimes stop working.
So now when I have tried countless ROMs based on 1.5 and 1.6, I want to get back to the earliest possible combination of ROM, radio and SPL to maybe get a fresh start. But where do I find "obsolete" ROM's etc for the Dream?
Today I´m running some experimental Hero-ROM with BLUR-objects by Drizzy, with latest radio and HardSPL (rooted of course). Is there any pitfalls in downgrading in any special order?
Best regards,
Christoffer
Several of us still have rom's saved on our pc's. You can ask for something and someone can provide it for you or you can google it and find older roms. Since you only have HardSPL there is no order to downgrade.
sounds like you want the RC29 image (US) or RC7 image (UK)
Both can be found HERE
This will replace rom, recovery, radio, and spl.
FYI, if you're running a Hero ROM (other than that tiny/mico/mini Hero one) then you're using the 1.33.2005 SPL, not Hard.
It has been mentioned over at the Modaco Forums that for AT&T Nexus one users the 3g reception is better if downgrading radio from shipped version EPE54B to ERE27 Radio. I want to try this but before I do I want to know that since I installed the latest Cyanogen Rom with gapps for EPE54B will the apps no longer work when I flash my radio to ERE27? Thanks in advance.
I find it strange that the ERE27 radio would be better for ATT 3G... but i you want to try that, go ahead and flash the radio via fastboot... no available ROM or firmware is tied to a radio version for the N1 and it won't disturb ur apps or settings...
craig thanks for the quick response, I find it strange too but take a look at the thread
http://android.modaco.com/content/g...exus-one-downgraded-radio-improved-reception/
it seems that a lot of people are having success with this. Another question if it doesnt matter what apps you have etc then why does cyanogen list the gapps for the different radio versions?
Well, with each new iteration of the official [leaked] firmwares, the cooks incorporate the updated Google Apps software and some firmware modules from within that ROM. So for a particular cooked ROM release, a specific Google Apps pack would work optimally with it. The radio on the other hand is simply the latest available at the time the ROM was released...
Hi, I recently bought a T-mobile HD2, the unit isn't unlocked yet but I plan to unlock it and use it with AT&T, anyways I'm interested in running Android on the device. Would updating the HD2 from the HTC website which I believe is the official update website prohibit me in anyway from locking out Android or do anything negative in terms of customization of the HD2 unit?
I am running the updated rom 2.13 I am on t-mobile though and I am able to use android all day but once I restart it reverts back to WM. So I am not sure if this helps you...I was able to get everything running but the calls sounded robotic. I read I needed to flash to a new rom.
Poopmonkey said:
Hi, I recently bought a T-mobile HD2, the unit isn't unlocked yet but I plan to unlock it and use it with AT&T, anyways I'm interested in running Android on the device. Would updating the HD2 from the HTC website which I believe is the official update website prohibit me in anyway from locking out Android or do anything negative in terms of customization of the HD2 unit?
Click to expand...
Click to collapse
Well first, if you have the T-Mobile version of the phone, you do NOT want to use an update from the HTC site, that's for the euro version of the phone. The upgraded stock rom that you can use is available on T-Mobile's support page for the HD2.
Now, flashing to the correct updated ROM will not prevent you from doing anything...you'll still be able to unlock it later, you can still run Android, and you can still do any customizations you want. It's just a newer version of the stock ROM that originally came on the phone.
Hey, thanks so much guys, I'll search for the T-mobile page. I'm glad you guys caught it before I bricked me phone.
BTW, I read that you the T-Mobile Version of the HD2 doesnt use radios. What exactly are radios? I know they mean like firmware versions but what is the term. Also, do you guys recommend flashing a different WM rom or just keep the stock one? I tried to read about Android on the HD2 but I need some user advice. Is Android now stable enough for everyday use on the HD2? Also, could you use applications on the HD2 Android Rom? Will they work as they should? Lastly, why didn't the developers develop a Android rom that you could flash so you didn't have to reboot into it after every Hard Reset?
Poopmonkey said:
BTW, I read that you the T-Mobile Version of the HD2 doesnt use radios. What exactly are radios? I know they mean like firmware versions but what is the term.
Click to expand...
Click to collapse
The US HD2 certainly does use radios, it just uses different ones than the euro version...in fact, that's most of the reason the wrong ROM could brick your phone, because of radio incompatibility. As you said, the radios you see referred to here are the firmware packages used to control the hardware radios in the phone (voice, 3G/EDGE, GPS, WiFi, BT). When you flash a different radio, you're applying a different set of settings to the way all that functions.
Also, do you guys recommend flashing a different WM rom or just keep the stock one?
Click to expand...
Click to collapse
That's generally completely a matter of personal opinion, some people will tell you that using a custom ROM is so critical that if you don't your grandchildren will walk funny, etc....whereas I am doing just fine running the stock ROM and just manually tweaking and hacking it to my liking, part by part. However, if you're going to be running Android on it, there's evidence that having a custom ROM vs the stock will help with some of the known problems with the Android ports that are available.
I tried to read about Android on the HD2 but I need some user advice. Is Android now stable enough for everyday use on the HD2? Also, could you use applications on the HD2 Android Rom? Will they work as they should?
Click to expand...
Click to collapse
There's several builds available, and all of the current ones are remarkably stable compared to the first attempts. But, I believe that that there's still not any that are absolutely 100% fully-functional...each has some minor drawback or caveat, like BT or 3G or the camera not working right, but usually that's the only issue(s). Also, it's been a couple of days since I checked on those, so they may have come even farther since then. One common drawback to all of them though is the heaaavvvy battery drain...but this is also being addressed as quickly as possible. And yes, in every build the apps and marketplace seem to be working just as they would on any factory android install.
Lastly, why didn't the developers develop a Android rom that you could flash so you didn't have to reboot into it after every Hard Reset?
Click to expand...
Click to collapse
That seems to have become the final frontier for Android on the HD2...the release of a fully stand-alone ROM. Trust me, they are working on that, there's tons of members here drooling and waiting for that exact thing. It requires a completely different method of loading Android into memory, so there's a lot more kinks to work out
sirphunkee said:
The US HD2 certainly does use radios, it just uses different ones than the euro version...in fact, that's most of the reason the wrong ROM could brick your phone, because of radio incompatibility. As you said, the radios you see referred to here are the firmware packages used to control the hardware radios in the phone (voice, 3G/EDGE, GPS, WiFi, BT). When you flash a different radio, you're applying a different set of settings to the way all that functions.
That's generally completely a matter of personal opinion, some people will tell you that using a custom ROM is so critical that if you don't your grandchildren will walk funny, etc....whereas I am doing just fine running the stock ROM and just manually tweaking and hacking it to my liking, part by part. However, if you're going to be running Android on it, there's evidence that having a custom ROM vs the stock will help with some of the known problems with the Android ports that are available.
There's several builds available, and all of the current ones are remarkably stable compared to the first attempts. But, I believe that that there's still not any that are absolutely 100% fully-functional...each has some minor drawback or caveat, like BT or 3G or the camera not working right, but usually that's the only issue(s). Also, it's been a couple of days since I checked on those, so they may have come even farther since then. One common drawback to all of them though is the heaaavvvy battery drain...but this is also being addressed as quickly as possible. And yes, in every build the apps and marketplace seem to be working just as they would on any factory android install.
That seems to have become the final frontier for Android on the HD2...the release of a fully stand-alone ROM. Trust me, they are working on that, there's tons of members here drooling and waiting for that exact thing. It requires a completely different method of loading Android into memory, so there's a lot more kinks to work out
Click to expand...
Click to collapse
Wow, thank you so much sirphunkee, you sir are a scholar with your detailed response. Anyways, I apologize but I am intrigued by your response and more questions evolve. Once my HD2 comes I assume it will have a older ROM version and a official T-Mobile Update will be available for me. Now, I'm just wondering would I need to worry about what radios I need or will that be taken care of for me.
Also, I'm still a little confused on the whole radio aspect. For example, in this picture located here:
hxxp://support.t-mobile.com/doc/images/tm54430/tm54430_06.gif
The image version is different one is 2.10.531.1 and the other 2.13.531.1. Are these the radio versions or is this like the ROM version. If so how do I find out what my Hd2s radio is? I mean before I flash a rom how do I find out the radio it contains? For example on your HD2, sirphunkee, in your signature, you have:
ROM: 2.10.531.1 (82076) WWE/5.2.21889 (Stock 6.5)
Sense: 2.5.2012
Radio: 2.08.50.08_2
So I assume that you don't have the latest stock ROM right? Also, what does the WWE mean in your ROM version. Would you recommend me updating my HD2 to the latest stock ROM or not?
Also, I read before you flash a phone you need to install HSPL3 on the phone. This is what I'm told is a bootloader. But then Im also told that usually this bootloader is paired with official or leaked roms so that each SPL matches the ROM, so if I need to flash a HSPL3 on my HD2 before I flash a custom ROM do I need to redo it everytime? I mean the HSPL3 is supposedly hard bootloader that survives a hard reset so it won't be wiped from the device until I overwrite it so does that mean I need reflash it everytime I get a new rom so it matches the ROM?
Anyways, sirphunkee, you mention tweaking the stock ROM, would you recommend BSB tweaks or something else because I read about it and users have discovered that they lose some functions after tweaking their phones. Also would I need to install this if I just plan to tweak the original/stock rom?
Furthermore, is Android on the HD2 currently run over/on top of the WM OS so could that be the cause of the heavy battery drain? Also, is the Android OS on the HD2 booted through an exploit in the firmware of the HD2? If so could this be patched? Just a personal opinion of everyone here do you believe that Android on the HD2 that is flashed onto the HD2's NAND itself will be possible/could this final frontier be achieved?
Again I would like to sincerely thank you for everyone's patience with me, especially sirphunkee. Thank you.
No problem!
Poopmonkey said:
Once my HD2 comes I assume it will have a older ROM version and a official T-Mobile Update will be available for me. Now, I'm just wondering would I need to worry about what radios I need or will that be taken care of for me.
Click to expand...
Click to collapse
Most of the HD2's built or shipped in the past 2 months have the newer ROM on them, but even if yours doesn't then yes you can just go to the T-Mobile site and get the newer one.
Both of the stock ROM's have the radio(s) included, so you don't have to worry about it if you just stay with one of those ROM's. If you flash a custom ROM it (usually) won't have a radio included, it'll just use whatever radio was already on your phone (i.e. whatever one came with the stock ROM originally). You can flash to different radio versions....ONLY ones that are clearly labeled as being compatible with the US HD2...doesn't matter if you're running a stock or custom ROM, but it does require HSPL first before a radio can be flashed.
Also, I'm still a little confused on the whole radio aspect. For example, in this picture located here:
hxxp://support.t-mobile.com/doc/images/tm54430/tm54430_06.gif
The image version is different one is 2.10.531.1 and the other 2.13.531.1. Are these the radio versions or is this like the ROM version. If so how do I find out what my Hd2s radio is? I mean before I flash a rom how do I find out the radio it contains? For example on your HD2, sirphunkee, in your signature, you have:
ROM: 2.10.531.1 (82076) WWE/5.2.21889 (Stock 6.5)
Sense: 2.5.2012
Radio: 2.08.50.08_2
So I assume that you don't have the latest stock ROM right? Also, what does the WWE mean in your ROM version. Would you recommend me updating my HD2 to the latest stock ROM or not?
Click to expand...
Click to collapse
The original stock T-Mobile US ROM (yes, the one I'm running currently) is 2.10.531.1 ("2.10" for short), and the newer one that's been released is 2.13...so that pic you linked there just shows the stock upgrade utility about to upgrade a ROM to the new version (with an included radio).
You can tell what ROM/Radio is on your phone by reading the little text that appears on the bottom of the screen during bootup, and you can also access that info through a settings option once the phone is running.
"WWE" = "WorldWide English"....just means that I have an english-based ROM. Other languages are available by applying ROM's specifically built for that language, but I honestly don't even know if any exist for the T-Mobile HD2, I think they're only available for the euro model.
Since it's very easy to flash the upgraded stock ROM, if your phone comes with the older one I would just suggest running that for a few days and see if it gives you any headaches....if so, then just go ahead and flash to the newer one. There's a number of threads in this section that discuss the differences in the stock ROM's, and the advantages/disadvantages of each. Regardless of which stock ROM you have, the process to flash to a custom ROM is the same either way (HSPL, etc).
Also, I read before you flash a phone you need to install HSPL3 on the phone. This is what I'm told is a bootloader. But then Im also told that usually this bootloader is paired with official or leaked roms so that each SPL matches the ROM, so if I need to flash a HSPL3 on my HD2 before I flash a custom ROM do I need to redo it everytime? I mean the HSPL3 is supposedly hard bootloader that survives a hard reset so it won't be wiped from the device until I overwrite it so does that mean I need reflash it everytime I get a new rom so it matches the ROM?
Click to expand...
Click to collapse
HSPL is "permanent", in the sense that it remains on your phone until you manually flash a different HSPL (like flashing back to stock SPL should you need to return the phone for warranty reasons). Once you have HSPL (yes, a hard bootloader) on your phone (HSPL3 being the latest/best to use), you can flash all the different custom ROMs or radios that you want, without having to apply HSPL again.
Anyways, sirphunkee, you mention tweaking the stock ROM, would you recommend BSB tweaks or something else because I read about it and users have discovered that they lose some functions after tweaking their phones. Also would I need to install this if I just plan to tweak the original/stock rom?
Click to expand...
Click to collapse
There a bunch of different things you can to to tweak a stock ROM, or to futher tweak a custom one, and BsB is just a nice tight convenient collection of some of the more common ones. I use BsB and don't have any issues related to it, but I also skip a few of the settings in it ("tap time" for example) that have caused issues for other users. Besides BsB, I also use HD2Tweak, JWMD Icon Changer, CHT/CHTE, as well as a whole list of other stand-alone tweaks that come in the form of cab files, or manual registry hacks...some are related to performance or function, while some are strictly visual or style tweaks.
Furthermore, is Android on the HD2 currently run over/on top of the WM OS so could that be the cause of the heavy battery drain? Also, is the Android OS on the HD2 booted through an exploit in the firmware of the HD2? If so could this be patched? Just a personal opinion of everyone here do you believe that Android on the HD2 that is flashed onto the HD2's NAND itself will be possible/could this final frontier be achieved?
Click to expand...
Click to collapse
I originially thought the same (that Android ran in parallel with WM and that was causing the batt drain), but from what I read it actually shuts down WM when it runs, so I guess that isn't the cause of the drain...but honestly I haven't been able to keep up with all the finer details of the Android porting that's going on. And yes, a version of Androd that will load straight to NAND at bootup is the final hurdle I was talking about, and that's exactly what a number of dev's are trying very hard to make happen....I suspect that a breakthrough in that is right around the corner, but I'm no dev so take that with a grain of salt!
Hope that helps! It will be a lot easier once you have the unit in-hand and can play with it yourself. Also be sure to look over this thread (if you haven't already): http://forum.xda-developers.com/showthread.php?t=663845
Thank you again sirphunkee! Anyways I just got my hd2 and for the most part I like it. Though, I have a question, how can I backup my contacts so that after a new rom install I dont need to relink their facebook accounts again? Basically, I don't have the same names for my contacts, I only have first names so I have to redo it manually one by one and I want to use activesync to do it but it's telling me I need Outlook. Why do I need Outlook? Isn't that a stupid outdated email application? Also, how do you remove all the bloatware like blockbuster from the HD2? Is flashing a custom rom the only option?
Also, I noticed a problem that windows marketplace apps seem to not install. I try to install Skyfire and I see the progress bar and it goes to like 3/4 of the way and never goes past that.
An unrelated question I want to install HSPL3 I have a SPL 2.10.000 on my Stock 2.13 T-Mobile I'm wondering since in the instructions it tells me, that:
*YOU CAN NOW CHOOSE WHICH VERSION OF SPL OR HARDSPL YOU WANT TO FLASH TO YOUR PHONE*
*You can only select between SPL2.08.0000 or 2.08.HSPL. This is to avoid people with 1024LEO's installing an incompatable version and bricking their device*
What exactly am I suppose to pick? A SPL or HSPL? I mean I want to run Android but will this HSPL interfere with my stock ROM? Also, can someone give me like specific instructions on what I need to pick in the installer?
anyone have a idea? I'd like to experiment with android but i wanna make sure i have the right settings to i dontt have a brick in my hands after I'm done.
Poopmonkey said:
Also, I noticed a problem that windows marketplace apps seem to not install. I try to install Skyfire and I see the progress bar and it goes to like 3/4 of the way and never goes past that.
An unrelated question I want to install HSPL3 I have a SPL 2.10.000 on my Stock 2.13 T-Mobile I'm wondering since in the instructions it tells me, that:
*YOU CAN NOW CHOOSE WHICH VERSION OF SPL OR HARDSPL YOU WANT TO FLASH TO YOUR PHONE*
*You can only select between SPL2.08.0000 or 2.08.HSPL. This is to avoid people with 1024LEO's installing an incompatable version and bricking their device*
What exactly am I suppose to pick? A SPL or HSPL? I mean I want to run Android but will this HSPL interfere with my stock ROM? Also, can someone give me like specific instructions on what I need to pick in the installer?
Click to expand...
Click to collapse
If you're just going to put android on the phone, you don't need to mess with H/SPL at all...you only need that if you're going to flash to a custom winmo ROM before putting Android on there.
sirphunkee said:
If you're just going to put android on the phone, you don't need to mess with H/SPL at all...you only need that if you're going to flash to a custom winmo ROM before putting Android on there.
Click to expand...
Click to collapse
Thanks for your reply once again sirphunkee, but it says in this thread that I need HSPL3 to get android to run stably.
http://forum.xda-developers.com/showthread.php?t=732380
Also, don't you need HSPL3 to flash a custom ROM in the first place as described here?
http://forum.xda-developers.com/showthread.php?t=653614
Poopmonkey said:
Thanks for your reply once again sirphunkee, but it says in this thread that I need HSPL3 to get android to run stably.
http://forum.xda-developers.com/showthread.php?t=732380
Also, don't you need HSPL3 to flash a custom ROM in the first place as described here?
http://forum.xda-developers.com/showthread.php?t=653614
Click to expand...
Click to collapse
I think what that thread is saying is that having a custom ROM is what helps with the stability of Android, not just putting HSPL3 on there (unless that's buried in that thread somewhere that I missed...). But yes, putting a custom ROM on the phone would have the prerequisite of HSPL anyway.
I don't have a custom ROM or even HSPL on my HD2, and I'm currently using the Desire v5 build of Android on here. It seems to run very stable, but I haven't yet gotten a few things working on it (i.e. 3G)...I can't say if a custom ROM would make those things work, but I can say it doesn't ever crash or hang or seem to slow down at all.
I just wanted you to know that HSPL wasn't mandatory for you to be able to try out Android on your phone.
Ok thank you so much sirphunkee again. Anyways, I'm wondering if you know why my weather will not update now when I ask it to on a Wifi connection. I try to update it and just says that its a connection error. And also my windows marketplace app installs seem to stall on the 3/4 complete and they never finish. Could you perhaps help me with that?
Lastly, I was wondering would you be able to tell me if I wanted to put a custom ROM on my HD2 what setting do I need to put on my HD2 for a successful flash?
FIND THE "ANDROID ON HD2" THREAD everything is explained.
Hi there,
Im very new here. I have a T-Mobile HTC HD2. Both HTC and WinMO are something new for me, as previously im iPhone user. Any guide/help is very appreciate. The phone keep hanging during boot. Usually its hang during the pink box and when htc sense finish load. How do I fix this?
I would like to install android on this phone. Is it possible for me to install after I update to latest OS(WinMo 6.xxx).
Update:
My HTC HD2 keep freeze during boot. Now I want back to normal, whatever ROM is it.
Welcome to XDA and whole real world as I am sure iPanzy kept you down but thats another matter for another day. Now I am not sure what pink box you are talking about you mean the splash boot? What are you using WM6.5? In that case look below.
Now you have few choice as HD2 is true multi platform device, as we are belessed with superior dev team and support many OS. You can use dual boot WM(NAND) and AOSP(mSD) or you can use NANDROID. If you pick dual boot I say use WM6.5.X as base 29XXX is by far the most superior stable then if you want to use AOSP then download and install Android on SDCard or skip all of that and use NANDROID as native.
Pink box I mean is probably shows "Stick Together" words
Now even worse, after few second the phone boot it freeze. I`ve tried factory reset, the same thing keep happening. What should I do now? Should I flash to new offical ROM/OS?
FYI in using T-Mobile HTC HD2 with 1024MB ROM.
For now let forget installing android on but focus on the freeze.
Thanks for the help STHNS
I know you are using Leo1024 as its TMobile also I had feeling it would be that ugly logo thats why I said splash boot. Which was the first thing I got rid of when I got HD2 and put custom splashscreen.
Now it would be unwise to jump in to Android as you might want to check if your HD2 is functioning properly so later if something does go wrong you can send it back for warranty without issue. So lets be clear what are you saying? You can't load in to your WM6.5? SenseUI never loads? or your stuck at bootscreen? Is it used/new? Where did you get this device?
My phone stuck on 3 difference places. I keep reset so the phone can be use normally. Indeed very few time its successfully boot.
1. Stuck on Pink box logo"Stick Together "
2. Stuck on loading Sense UI
3. Stuck after finish loading Sense UI.
Most of it stuck on 2 or 3.
Well no problem first where did you get this device? I have a feeling its used and you got it though some type of shady deal where original owner gave you talk about blah blah lol thats why he sold it, I could be wrong
But serious matter here shut the HD2 down completely and power it back on. Then report what you see the in steps. Hopefully you got it new if something is wrong due to faulty hardware you can send it for repair or warranty. But I have a feeling you don't thats why you came here :O again I could be wrong I am just always suspicious
Its used and i bought it on eBay.
Btw how could flash to offical ROM?
What rom is on it? And why would you want official rom? If you want WM based rom go use EnergyROM WM6.5.X 29XXX base as its far more stable.
EnergyROM WM6.5
Does the installation is same as official ROM?
To test the phone, I advice to go to the HTC Website and download a ROM (you have to use your phone's serial number to guarantee to get one suitable for your phone). If I remember correctly there are 3 variations: 2.08, 2.10 and 3.14. - go for the 2.10 (just to keep away from the 3.14 version as you want to move onto Android). Flash the ROM.
After a hard reset there should be no problems, if there is then your phone has hardware issues.
Thanks for the info fred.
Where I can download the 2.14 version?
What is shipped ROM?
What the diffence between shipped ROM vs official ROM.
Sorry for a lot questions. HTC and WinMo is something new to me. Im iPhone user.
2.14? You mean 3.14?
1) Shipped rom is the default manufacture rom that comes standard on it.
2) No diff between shipped and official rom they are same thing we call them stock rom. Which is supported and maintained by the folks who made the phone.
If you want to upgrade stock rom not sure why you want to do that you can go to Tmobile website and check under wmupgrade or go to HTC website and look under support. I say you forget about WM 6.5 stock rom and go use WM6.5.X EnergyROM base 29XXX its simply superior in every aspect.
The reason I suggest you flash, for example, the 2.10 ROM is that it will flash the SPL, the main ROM and the RADIO. This will get the phone running fully on an official ROM.
The problem you have can either be modifications to the operating system software or additional software or a hardware problem. By flashing a stock (official) ROM you will have cleared the existing operating system and additional software. Now if the problem is still there then it is very likely that it is due to a hardware problem.
If after flashing the problem is gone, then by all means flash the excellant Energy ROM or flash your desired Android ROM.
If you only flash a custom ROM which does not include the RADIO (which controls all communication interaction and not just the FM Radio) then you are reducing the chances of finding out the problem.
Silly question, have you tried booting the phone up without the SD Card?
After all the problem, freeze, hang up and etc I no longer put any sd card on my htc hd2. I beleive the problem might be with the hardware. But why not we try our best before given up on it.
I had several simple questions.
1. Can radio be downgrade?
2. What radio for? Its same like baseband on iPhone
3. Where I can download 2.10 HTC HD2 US T-Mobile? Search here found nothing
StarScreamx said:
After all the problem, freeze, hang up and etc I no longer put any sd card on my htc hd2. I beleive the problem might be with the hardware. But why not we try our best before given up on it.
I had several simple questions.
1. Can radio be downgrade?
2. What radio for? Its same like baseband on iPhone
3. Where I can download 2.10 HTC HD2 US T-Mobile? Search here found nothing
Click to expand...
Click to collapse
1) Yes you can downgrade Leo_Radio's long as you use the correct one as you know there is .50 for HD2-US(Leo1024) and .51 HD2-EU(Leo512).
2) Radio is software that controls your phones wireless interfaces such as data, voice, bluetooth, gps, wifi and other power and memory related firmwares. Well never used iOS so can't say what they call it but far as AOSP goes yes we call it baseband.
3) Search for TMoUS 2.10 stock rom and you will find it or do search in this forum as I am sure someone has it archived.
3)
Answer to your question No. 1 - Yes, Radio can be downgraded and upgraded if you install HSPL prior to downgrade/upgrade. FOr the rest you have to search the forum for the answer.