unable to upgrade from b160 (L21c432B160) - Huawei P9 Lite Questions & Answers

I was on nougat (upgraded with firmware finder) then I did rollback to marchmallow.
Now I'm trying to get back to nougat but every method I try I get software instalation failed. I use firmware finder and I download thrue proxy. when package is downloaded i reboot instalation starts but after few seconds i get software instalation failed. same thing happend on every build I choose.
I tryed this method also but with same result (https://www.getdroidtips.com/huawei-p9-lite-stock-firmware-collections/)
I tryed factory reset on b160 and i did format sd card but nothing helps!
any solution for this problem?
tnx in advance!

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Hello, im here again with another "brick" which i cant fix by myself for one day. I was on beta firmware B313, but i decided to downgrade to B200, now, im bricked, i cant flash any firmware, everthing ends with error at 5 percents, recently i have B313 files (boot.img, recovery.img) because thats the only version i can boot into recovery from and its at least trying to boot into system, but after logo it restart. When i flash files from B170 or B200, it cant even boot into recovery, can anyone help?
00471 said:
Hello, im here again with another "brick" which i cant fix by myself for one day. I was on beta firmware B313, but i decided to downgrade to B200, now, im bricked, i cant flash any firmware, everthing ends with error at 5 percents, recently i have B313 files (boot.img, recovery.img) because thats the only version i can boot into recovery from and its at least trying to boot into system, but after logo it restart. When i flash files from B170 or B200, it cant even boot into recovery, can anyone help?
Click to expand...
Click to collapse
you had to first install the b300 downgrade file and then the B170 firmware. You can try to install it, it takes you to the version b300
caloger said:
you had to first install the b300 downgrade file and then the B170 firmware. You can try to install it, it takes you to the version b300
Click to expand...
Click to collapse
Thank you very much, it helped. Every tutorial to unbrick the phone mention only B200, not B300 first so i didnt know. Have a nice day.

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