Failing to downgrade Honor 5X KIW-AL10 (Chinese variant)

[SunnyTee]

hi folks,
So, i got honor 5X KIW-AL10 (Chinese variant with 2GB ram). I love the phone but i don't really like EMUI. Here's the info:
Lollipop build number: KIW-AL10C00B258 which updates to KIWAL10C00B430 (VoLTE patched MM update). VoLTE update means no custom ROMs. So far, i have downloaded and tried to flash different firmware for the same variant like KIWAL10C00B419 (no VoLTE patch) but it fails because B258 can only be upgraded to B430. I am trying to downgrade the lollipop version to B191 now by flashing its recovery.img, cust.img, system.img and boot.img and then force downgrading. But flashing cust files gives an error:

Sending sparse 'cust' (260038KB)...
OKAY [ 9.673s]
writing 'cust'...
FAILED (remote: Command not allowed)

Any ideas guys? I need to downgrade to earlier versions to be able to get the MM update without VoLTE.
P.S. My bootloader is unlocked.

 

[SunnyTee]

Anyone???

 

[imeicodes]

i have same problem u solved ?

post here volte disable firmware list

 

[gopinaidu77]

U can flash L24 rom but rebranding is necessary

 

[sidgboy]

hi folks,
So, i got honor 5X KIW-AL10 (Chinese variant with 2GB ram). I love the phone but i don't really like EMUI. Here's the info:
Lollipop build number: KIW-AL10C00B258 which updates to KIWAL10C00B430 (VoLTE patched MM update). VoLTE update means no custom ROMs. So far, i have downloaded and tried to flash different firmware for the same variant like KIWAL10C00B419 (no VoLTE patch) but it fails because B258 can only be upgraded to B430. I am trying to downgrade the lollipop version to B191 now by flashing its recovery.img, cust.img, system.img and boot.img and then force downgrading. But flashing cust files gives an error:

Sending sparse 'cust' (260038KB)...
OKAY [ 9.673s]
writing 'cust'...
FAILED (remote: Command not allowed)

Any ideas guys? I need to downgrade to earlier versions to be able to get the MM update without VoLTE.
P.S. My bootloader is unlocked.

Hi, I am trying to install Lineage OS and I encounter the same issue, di dyou figure it out?
Where did you find the KIWAL10C00B419 firmware? It seems that this one would be a good base to install Lineage Os. Thanks in advance.

 

[sidgboy]

Alright after a few days of trying to downgrade, flashing Lineage OS and ending with a bootloop, I eventually figured it out.
There's actually no need to downgrade, you can install Lineage OS with the most recent firmware on your phone: KIW-AL10C92B437.
Once you have unlocked the bootloader, flash TWRP with adb, you need to flash Lineage OS & a zip that will fix the loop (see: https://jira.lineageos.org/browse/BUGBASH-222?attachmentViewMode=list). I used Fix_boot(422+).zip. Voilà!