Dual Boot Roms - Nexus 7 Q&A, Help & Troubleshooting

If I do decide to unlock my boot loader, could we dual boot roms?
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Not as of now though it *may* come though I doubt it seeing how not many other tablets have dual boot features either. One way to simulate it is to just set up a ROM then back it up in recovery and then wipe and set up a new ROM and then backing that one as well. Then restore the one you feel like using. Sure it takes ages for backups to restore but it works for now.

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[Q] dual booting

I know the winmo phones can dual boot winmo and android. They boor android from the sdcard.
Im wondering if we can get are phones to dual boot so we can have are working rom ect.... And we can dual boot into the secondary android from the sd card to test are mods
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The short answer is: no.
mysteryemotionz said:
I know the winmo phones can dual boot winmo and android. They boor android from the sdcard.
Im wondering if we can get are phones to dual boot so we can have are working rom ect.... And we can dual boot into the secondary android from the sd card to test are mods
Sent from my Emotionless Beast of an Epic using the XDA App
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Click to collapse
They can dual boot because Android is an open OS and is free. It would be illegal to put Winmo on our devices without paying for the proper license.
Also, for what possible reason would you even want to do this? To use as a reminder of how primitive Winmo looks and was compared to Android?
muyoso said:
They can dual boot because Android is an open OS and is free. It would be illegal to put Winmo on our devices without paying for the proper license.
Also, for what possible reason would you even want to do this? To use as a reminder of how primitive Winmo looks and was compared to Android?
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I wanna dual boot with 2 separate sets of android for testing purposes
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I think yes, it would be possible. I wouldn't know how, but its been done on android before, and there is an alpha version being worked on already for the Sammy Moment at SDX and Samdroid.
And if this could be achieved it would be a great to help to developers.
I think I would like it just for the purpose of trying out new roms without having to give up my current rom, in case I don't like the new one.
RKight said:
I think I would like it just for the purpose of trying out new roms without having to give up my current rom, in case I don't like the new one.
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if you do a full backup, flash a new ROM, restore data (only) and you don't like the new ROM, you can go back into recovery, restore full backup and voila.. you're back to the ROM you just backed up.
takes 3 minutes to do all this.
no need for dual boot IMO
daddymikey1975 said:
if you do a full backup, flash a new ROM, restore data (only) and you don't like the new ROM, you can go back into recovery, restore full backup and voila.. you're back to the ROM you just backed up.
takes 3 minutes to do all this.
no need for dual boot IMO
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Certain themes with the battery percentage mode will cause boot problems from recovery
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daddymikey1975 said:
if you do a full backup, flash a new ROM, restore data (only) and you don't like the new ROM, you can go back into recovery, restore full backup and voila.. you're back to the ROM you just backed up.
takes 3 minutes to do all this.
no need for dual boot IMO
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Click to collapse
I'm aware of that process but if I'm just wanting to tinker with a new rom, I really don't want to go through all that trouble. If I want to try a new Linux distro on my PC, I'm not going to ghost it, install the new distro, then restore the old image later. I'm going to throw the new distro on a second hard drive and dual boot while I decide if I like it. That way, I have a known stable OS, configured the way I want, just a reboot away.
mysteryemotionz said:
Certain themes with the battery percentage mode will cause boot problems from recovery
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I have noticed this as well, and a flash with odin plus reinstalling clockworkmod is the only thing that prevents it from corrupting your backups for future use.
daddymikey1975 said:
if you do a full backup, flash a new ROM, restore data (only) and you don't like the new ROM, you can go back into recovery, restore full backup and voila.. you're back to the ROM you just backed up.
takes 3 minutes to do all this.
no need for dual boot IMO
Click to expand...
Click to collapse
I don't know. That's fine if you just want to try out a ROM one time, and quickly, or if you can do without your main ROM for a long time. I had a windows phone before I switched to Android. Having the "dual boot" was key to my switching to Android. I was able to install Android, set it up the way I wanted to (which took lots of time) and "play" with it whenever I had time, but at other times I needed to be able to switch back to my main phone. I'd switch a couple times a day sometimes (just a single click to go either way). After a couple of weeks of being able to work with Android I knew I'd be happy switching.
You could do something like this with backups and restores, but I honestly think it would get overly cumbersome. You'd have to backup your main ROM and then the second ROM. Every time you changed a setting or moved something around in either ROM you'd have to remember to make a new backup, or the next time you switched into that ROM all of your changes would be reverted back.
In any case, I don't know how possible it is to have dual boot, but I can certainly see a lot of advantages for some people.
HARET is what makes the WinMo android boot possible and is based on work done with soft/hard SPL. No Android equiv to HARET exists yet. However, a lot of work is happening with HBOOT due to the Vision G2 eMMC situation. I wouldn't be too far off if I were to speculate that an android HARET may be in our future.
Go check out this thread from the Eris forums. - Dual boot recovery hack
As I'm not intimately familiar with the inner workings of Clockwork, I don't know how plausible it is on the DX. It could either be really easy to port since we're already bootstrapped, or nearly impossible. That's a problem for a dev much smarter than me to conquer.
I will say that I tried it out on my Eris. The stock class 2 card was unbearably slow, a class 4 was tolerable, and a class 6 (which cost a small fortune) ran as if it was installed internally. Kinda neat, but not terribly practical for daily use.

[Q] Dual booting roms

Does anyone know of a dual booting recovery or a way that i can have two ROMS at once on my phone. That way i can freely switch on start up from cyanogen mod to MIUI.
giggz2010 said:
Does anyone know of a dual booting recovery or a way that i can have two ROMS at once on my phone. That way i can freely switch on start up from cyanogen mod to MIUI.
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I don't know about having two ROM's at once but you could just make a backup of both CM7 and MIUI. It saves all your setting and only takes about 5 minutes to flash from one to the other.
I assume your referring to a nan-droid backup and if that's so i would love to do that but the issue with that is i have the default android software saved there. I would over write it but the fear of losing it and not being able to flash back in case i need to take my phone back to the store and get a new one. I have actually done this before and they accepted it because i flashed the factory software from a update on te HTC page, unfortunately there is no update from the original software on the HTC site for the shift.
You can make multiple backups through ROM manager. I have both a Cm7 and a MIUI backup saved to my SD card.
giggz2010 said:
I assume your referring to a nan-droid backup and if that's so i would love to do that but the issue with that is i have the default android software saved there. I would over write it but the fear of losing it and not being able to flash back in case i need to take my phone back to the store and get a new one. I have actually done this before and they accepted it because i flashed the factory software from a update on te HTC page, unfortunately there is no update from the original software on the HTC site for the shift.
Click to expand...
Click to collapse
No he is speaking of a dual boot recovery, where when I powered my phone up I could choose cm7 or I could choose miui to load, and I would have this choice everytime I booted.
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I've been looking for something like this for cm7 and sense dual booting.
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There was someone working on this on the heroc forum, but I'm unsure if it ever actually worked or not.
I would much rather choose upon booting then going through the rom manager. Although i have never tried what you were speaking of so I'll give that a shot. Hopefully i can get MIUI to stop randomly restarting itself so i can use the ROM.

[Q] hotswapper?

I'm on Evo ... currently I'm running cm7 or fresh gb or kingdom... I have backups of all 3 with the way I like them setup etc... my question is this: is there already or the possibility of someone making a hotswap function between them... kinda like when you choose os when your PC loads up... or even better in the power toggle when you can select boot recovery you could just select which backup you want....
You can use rom manager which would sort of mimic what you are looking for. It still goes through the process of restoring your backup, but it is done through the app and then the phone restarts itself, restores and the boots up the Rome you restored. Granted its not like dual booting an os on your PC, but its the best you have atm.
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Clockworkmod, more roms paralell?

Hey,
can I have 2 or 3 android roms with clockwork mod?
Just for testing which is my favourite one and not always have to backup etc.
thx
Hi
I don't think there is anyway to dual boot 2 Android roms. i've only seen windows/Android dual boots and searching google didn't bring anything up I could see.
I would just have all the zips I wanted to test ready to go on my sd card and install 1 at a time until I found which one I preferred.
I might be wrong though.
yes, as long as both roms use the same partition sizes. all you would have to do is to flash the 1st one, set it up as you want it, make a nandroid backup, do a full wipe, flash the 2nd, set it up, make a nandroid, and you can do a wipe, flash whichever rom, then restore your nandroid, and you're all set, and able to switch back and forth that way.
but the easier way is to run a nand android build, and one or two sd builds from magldr ad sd. wiping, flashing, and restoring is a bit time consuming, rather than settin up ur nand & sd builds once and just choosing what to boot into without the wiping, flashing, restoring hassle.

Dual booting on the nexus 6p?

Ive been fidiling with andorid devices and root for a long time now,l but I never went into dual boots, I was wondering if I can dual boot on my nexus 6p, say like stock rom and purenexus?
Use a twrp nandroid and just flash between the 2?
I've never seen an actual dualboot with a menu or whatever.
Eventually multiRom will be ported over, until then, sit tight.

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