MHA-L29 Unsupported Patch - Is There Any Way to Downgrade

[iphonefubiz]

I want to unlock this phone but unfortunately, security patch is not supported.

I'm looking for possibilities by downgrading the OS.

Is it okay to install this firmware?
MHA-L29B_C185B182_Firmware_UAE_Iraq_South_Africa_Egypt _Nonspecific.APP

The phone is SSmart Ph locked.

Looking for a device in upgrade mode
No devices detected in upgrade mode
Device found: AHK7N17707001040


2/17/2019 10:08:39 PM Starting to write device in FASTBOOT mode...
Current version: MHA_EMUI6.0_Oversea


Looking for a device in fastboot mode
Device found: AHK7N17707001040

SN:AHK7N17707001040
IMEI:
IMEI1:
MEID:A000007A01F84F
Build number: :MHA-L29 8.0.0.378(C636)
Model: MHA-L29
Battery state: 5494mv

Device with unsupported security patch
Process was cancelled by user

[Valdemaras]

We won't be able to advice on downgrade.