P40 pro Flash Sigmakey

[stauffe2275]

hi,
i tried to downgrade my p40 pro to ealier version.
I did the following:
Flash OEM Info: OEM_INFO_Huawei_ELS-NX9_ELS-N29 10.1.0.114(C432E8)
Flash Via Upgrade Mode: Elsa-N29D 10.1.0.176(C432E8R6P1) Firmware EMUI10.1.0 05016PSR

Current Version is:
Version: ELS-N29 12.0.0.228(C432E3)

Here is device info:
Battery voltage: 3.81 V
Phone model: Skipped
Build number: ELS-N29 12.0.0.228(C432E3)
Vendor/Country: Skipped
System version: Skipped
Android version: 10
Base version: ELS-LGRP4-OVS 10.1.0.159
Custom version: ELS-N29-CUST 10.1.0.9(C185)
Preload version: ELS-N29-PRELOAD 10.1.0.1(C185R6)
Huawei-Over-the-Air info:
C_version: C185
D_version: D000
PLMN: 65510
BoardID: 9592


Sigmakey sais that version doesnt fit, I tried with different oem version Flash filed but allways same result. what am i doing wrong?

[kikas112]

for what u need downgrade ? and why u flash oeminfo?

[stauffe2275]

Downgrade is needed in order to cleanly install google playservices. Actually it was a retail demo device. I need to flash oem info in order to be able to flash a ‚normal‘ version number (like c432). I did same procedure with a Huawei p20 recently and everything was fine.

[kikas112]

its not need flash oeminfo, just fix country vendor thats it. first u can try flash downgrade stock by test point com1.0, if it new security it will not work anymore

[stauffe2275]

Ok thanks. Can you show me what file I need exactly? Or just the name, I can find by myself then.
I‘m using testpoint with modified cable