Downgrade from Oreo stock(8.1) to Nougat(7.0)

[anhoxhrs]

Hello,
1.Can we downgrade to 7.0 from 8.1? If yes,how?
2.Problems which may arise during downgrade?
3.If no why?
I'am fedup with the performance of 8.1,bootloops sometimes, network problems,and majorly battery backup and low volume issue.
#TIA

 

[strongst]

Hello,
1.Can we downgrade to 7.0 from 8.1? If yes,how?
2.Problems which may arise during downgrade?
3.If no why?
I'am fedup with the performance of 8.1,bootloops sometimes, network problems,and majorly battery backup and low volume issue.
#TIA

Did you installed the twrp version of an Oreo rom or which rom do you have. Did you have an unlocked bootloader? How did you update to oreo?

 

[anhoxhrs]

Upgraded to 8.1 (stock)through adb,i have bootloader unlocked and also have twrp.(no custom rom installed)

 

[strongst]

Upgraded to 8.1 (stock)through adb,i have bootloader unlocked and also have twrp.(no custom rom installed)

You cannot downgrade the bootloader if you flash the stock nougat rom by fastboot, otherwise it's hard bricked.

But I don't know if stock nougat rom will work with stock oreo bootloader @echo92, you know it maybe?

 

[echo92]

Upgraded to 8.1 (stock)through adb,i have bootloader unlocked and also have twrp.(no custom rom installed)

You cannot downgrade the bootloader if you flash the stock nougat rom by fastboot, otherwise it's hard bricked.

But I don't know if stock nougat rom will work with stock oreo bootloader @echo92, you know it maybe?

If stock Oreo is downgraded to Nougat, the bootloader may work with either firmware, I don't know for certain. However, OTA updates must be avoided if there's been a downgrade to Nougat or earlier (unless you're using the Oreo OTA); attempts to use old OTA updates on downgraded firmware is a great way to hard brick (and currently without recourse - we do not currently have a working Oreo blankflash).

However, if you downgrade your firmware, I am concerned you may lose SIM access/IMEI, given your baseband is on .77R (Oreo), whereas downgrading to Nougat would result in a baseband of .62.02R due to changes between the 2 basebands. You may have to consult this thread if you do lose your SIM/IMEI https://forum.xda-developers.com/moto-g4-plus/how-to/guide-moto-g4-plus-imei0-issue-t3859068
@anhoxhrs Have you considered replacing your battery, or at least ruled out battery issues like a failing battery? I'm just wondering if the bootloops and poor battery life may be due to the battery. Also, when you updated to Oreo, did you clean flash or factory reset your device?

 

[anhoxhrs]

The SOT has reduced by 30%,and most of the battery is consumed by mobile standby(weird).Its a clean flash. being my primary phone, 8.1 is troublesome.Yeah the battery was pretty good before the update.Chargeing time also has increased.for eg- 95 to 100 about 1/2 hr to 45 mins.