Fastboot: FAILED (remote: image verification error)

[amineblair]

Hi,
i bricked my phone today (HUAWEI P9 LITE L31), i changed OEMinfo after unlocked, installing recovery and rooting my device ( changed to EUROPE version ) but then the problem begin , every application of google crash , can't add my google account.
i tried to flash Android 7 with DC-UNLOCKER, it failed, and the big problem is i can't INSTALL any Recovery.
Please help me
PS: my serial number gone too

-------- The message when i try to install recovery --------
Processing archive: .\recovery\p9\p9.zip

Extracting stockrecoveryp9mm.img
Extracting twrpp9mm.img

Everything is Ok

Files: 2
Size: 65646592
Compressed: 65210421

target reported max download size of 471859200 bytes
sending 'recovery' (28928 KB)...
OKAY [ 0.623s]
writing 'recovery'...
FAILED (remote: image verification error)
finished. total time: 0.640s

[Valdemaras]

You should try flashing it via fastboot and then via upgrade mode with same update.app file.