LineageOS 19.1 [S] [12.1] (Unofficial) Mi Pad 4 Plus (clover+)

[dorkshoei]

Another question.

Sometimes if I connect a USB cable (for data) I get a "wave graphic" on the screen. It looks like a wave moving up the background from the bottom to the top for about 1 second. I think it's signifying an error in making the data connection but I can't find more info on this.

 

[tim-scrap]

Another question.

Sometimes if I connect a USB cable (for data) I get a "wave graphic" on the screen. It looks like a wave moving up the background from the bottom to the top for about 1 second. I think it's signifying an error in making the data connection but I can't find more info on this.

Well as los 19 is not updated anymore you have to look at los 20.

 

[dorkshoei]

So my kids cracked my screen. I replaced it. Tablet was fine for few hours until I turned on the camera (with it showing 90% charge).

Screen flickered and it hard reset.

Somehow the battery must have spontanously failed (really bizarre). On reboot I was getting weird issues, bootlooping, flickering screen in TWRP (which went away after plugged into USB for 20 mins) and very erratic battery level reporting. Eventually the battery just quit reporting it was charging.

I load tested the battery and it failed at 1/2A (immediately dropped under 3V). I jerry-rigged the battery upto a bench PSU and was able to get the tablet running more reliably.

But still bootlooping ..... note: during the lengthy debugging I did erase all the partitions without thinking; I guess per the following I must have wiped the proprietary xiaomi stuff :-(

sabar_op suggested trying to flash the stock rom using xiaomi flash tool. I did this and amazingly it worked. I can boot into the stock android BUT I now seem to have a locked bootloader.

If I try the Xiaomi unlock tool it connects and tells me it's locked and I need to boot, go into "developer options" -> "mi unlock status".

But when I try to do that it tell me I need to insert a SIM card. I bought it unlocked from AliE.

Also, AFAICR only AT&T wireless supported the LTE on this device (which probably explains why my Google Fi SIM did nothing).

Is there any other way?

 

[GregEden]

@dorkshoei you could try ADB and use the unlock command.
Note there is a typo in this - he means devices not devies, it is a way to confirm your computer is actually talking to the tablet. It lists connected devices.

{2024 Update} Unlock Bootloader Of Any Android With Fastboot Commands

Fastboot and ADB commands allow unlocking your Android bootloader, enabling custom OS and firmware. This guide covers using fastboot and ADB to securely unlock.

rootmygalaxy.net

 

[dorkshoei]

@dorkshoei you could try ADB and use the unlock command.
Note there is a typo in this - he means devices not devies, it is a way to confirm your computer is actually talking to the tablet. It lists connected devices.

{2024 Update} Unlock Bootloader Of Any Android With Fastboot Commands

Fastboot and ADB commands allow unlocking your Android bootloader, enabling custom OS and firmware. This guide covers using fastboot and ADB to securely unlock.

rootmygalaxy.net

You mean fastboot, not adb.

I already tried "fastboot oem unlock" and it failed.

# ./adb devices
List of devices attached
97e0c420    device

# ./adb reboot bootloader
# ./fastboot oem unlock
FAILED (remote: 'Token Verify Failed, Reboot the device
')
fastboot: error: Command failed

I had a BAD FEELING that restoring the stock image, at least using the Xiaomi Flash defaults, was a suboptimal idea.

 

[dorkshoei]

My understanding is that for Xiaomi you need an unlock code.

There are a lot of stale and poorly written articles such as this.

 

[arya_farjand]

use a lte dongle and put a sim inside of it. you will be able to unlock it

 

[GregEden]

This is a long abandoned ROM and forum thread. It has been on Android 13 for a long time.

https://xdaforums.com/t/lineageos-20-0-android-13-for-mi-pad-4-plus.4501317/