Can we downgrade oreo to nougat or marshmallow without any issues ?
If you do downgrade your stock (i.e. Motorola) firmware, there's a few things to bear in mind:
1) you will need an unlocked bootloader to downgrade firmware. The process of unlocking your bootloader will erase your device, so back up accordingly. If your SD card is adopted as internal storage, the encryption key for your SD card will be erased too. You'll lose your SD card data. Also, you will not be able to lock your bootloader unless you flash the latest stock firmware again (if you're on Oreo firmware, you can only use Oreo firmware)
2) downgrading is usually straightforward. However, you will not be able to downgrade your bootloader and GPT. For this reason, do not use OTA updates whilst downgraded with stock firmware. You'll likely hard brick your device.
3) instead of flashing the stock firmware, you could alternatively unlock your bootloader and then try the TWRP flashable firmwares https://forum.xda-developers.com/moto-g4-plus/development/rom-oreo-8-1-0-soak-test-t3873367 you will need the TWRP recovery, however TWRP flashables might be safer to use to downgrade than flashing stock firmwares.
Related
I'm looking to upgrade to pf4 (with root). I'm currently on OG5, with the bootloader on OD5. I know a while back it was suggested not to upgrade the bootloader, as I could downgrade. Is it advisable at this time to flash (with fireflash or safestrap), or is there some other way that keeps the bootloader at OD5 (or do we care anymore)? Unfortunately I have a CID of 11 .
MM, like LP, requires a bootloader update so you have to choose if you want to update and never downgrade to KK again or keep the option to downgrade to KK but never be able to upgrade to MM.
Because the (SM-N900V) bootloader unlock allows you to flash anything you please in the Odin AP slot (but probably not a bootloader firmware downgrade), I'm wondering:
Have any of you tried partial-stock Odin flashes (just boot.img and system.img) which downgrade only the Stock ROM and kernel?
[ for example, you are on (unlocked) OF1 or OB6 and you flash just boot.img/system.img from the Stock NK1 distro? (clean flash obviously; I suppose the system.img could also be pre-rooted & pre-debloated) ]
This is mostly for the lulz; what I am wondering is if the stock kernels enforce a "bootloader version match" policy (in addition to the bootloader Odin flashing Anti-Rollback enforcement). The bootloaders pass their version string as a command line argument to the kernel that they boot; I suppose the stock kernels could use that value for lockstep-policy enforcement.
I'd run the experiment myself, but I'm still on MJ7 so there's little for me to test (afaik MJ7 can be downgraded to MI9 even *with* a locked bootloader)
One of these days I'll upgrade my boot firmware*, but that day hasn't arrived yet.
* there are multiple experiments which could be run at that time:
(a) Odin flash only bootloader, tz, apnhlos & radio firmware "underneath" a custom or rooted ROM, eliminating the need to re-root prior to re-performing bootloader unlock on upgraded firmware.
(b) use dd to manually flash all bootloader, tz, apnhlos, & radio with an offline-modified aboot, creating a pre-unlocked, pre-rooted firmware upgrade.
(b) seems a bit more dangerous esp. if there is any real time protection of firmware partitions in the tz.
Why is it whenever someone has a real question not Android central stupidity there is no help?
danbracket said:
Why is it whenever someone has a real question not Android central stupidity there is no help?
Click to expand...
Click to collapse
Because @bftb0 is pretty good all by himself and most, if not all the 'heavy' developers no longer visit this forum.
Sent from my SM-N900V using Tapatalk
I'm gone all week every week driving and have so much to do when I get in I don't have much time to follow all of the advancements. I am rooted with OD5 bootloader. Running MOAR 6.62 / 5.0 with OG5 firmware. I like the customization abilities of MOAR but it's not essential. Native tethering for the laptop on the road is critical (unlimited data). I am on the original safestrap (3.75)? I use the NI2 flasher and I'm comfortable with odin. I already use SU pro version. Is there a down and dirty way I can go up to 6.0 without having to learn new methods/apps to do so? Or what's the easiest way with my setup to achieve this?
I apologize for asking a question that has doubtless been asked a number of times. I just am so pressed for free time.
Thanx in Advance and don't scorch me too harshly with flaming !!
Steve
Is your bootloader unlocked ?
I
Check by booting into download mode and looking for developer mode if you see it flash twrp in Odin
If not go to getex kk-mm bootloader unlock thread on XDA under s5 Verizon section then
If it is Then boot into recovery and flash mm rom
I flash in this order
Do a Backup in twrp to external SD card or USB otg drive
Do a full wipe except USB storage and external SD card
Then flash mm kernel
Then flash mm modem
Then flash ROM
Then reboot
If it bootloops then flash cm13 as a base then flash your ROM again in twrp
If it doesnt bootloop you are good
If you have problems try a different ROM
No it's not a dev edition
It doesn't have to be what it does have to be to get bootloader unlock is a Samsung 15 emmc you can check this by downloading the emmc brick Bug app on Google Play
if it is a 15 Samsung emmc then you can bootloader unlock from getex kk-mm bootloader unlock thread on xda
once you get bootloader unlocked you can install TWRP using odin
from there you can install a custom marshmallow ROM in twrp
This is the fastest and easiest way
I'm sorry I should've stated it's an 11
You can't have root on mm rom with a locked bootloader so sorry man
You can be rooted on highest lollipop firmware pb1 that is it
Hey guys.
I have just unlocked the bootloader on my p9 and am about to flash TWRP and root. It got me thinking:
Is there a way to return it to complete stock if want to just in case? I've seen firmware lying around on the forum, but does it return the phone completely to stock? And in that case, how do exactly do I flash it?
And furthermore, is there a way to backup the stock recovery image?
Yes, you can unlock/lock bootloader, procedure is similar...
And you can flash stock recovery again, is not need to backup, around is a toolkit who do what you want (unlock/lock, root, flash stock recovery etc)...
Yes, flashing the stock ROM (http://forum.xda-developers.com/huawei-p9lite/development/stock-firmware-links-t3468245) will relock the bootloader
I want to relock bootloader without downgrading to (or using) fw340. I intend to flash stock recovery then lock bootloader. After that flash stock pie rom vai stock recovery. does any method exists just to lock bootloader instead of flashing whole rom.