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I haven't been able to install any custom ROM, please help me! :(

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Nov 1, 2016
I've tried to install some custom ROMS and always I have problem, both for ROMS with extension .zip (with TWRP) and for extension .img(with ADB). Anyway I always fail. Even to make backups with TWRP, also to wipe cache. For all always there an error, I don't understand why. In the past I had install Samsung ROMs without problem, but in Huawei have been an infernal experience, all is so much hard.

-When I try to wipe cache, appears an error that says
"Unable to wipe cache.
Unable to wipe /cache."

-When tryng to flash stock recovery from TWRP appears an error that says
"Size of image is larger than target device"

-When tryng to make BACKUP with TWRP appears an error saying
"Can not create '/external_sd/TWRP/BACKUPS/<<serialnumber>>/<<actuallydate>>' folder (Permission denied).
Failed to make backup folder."

-When trying to flash a .zip ROM from TWRP says
"Updater process ended with ERROR: 7
Error installing zip file 'external_sd/LineageOS15.1-Hi6250-08-18-2018.zip'

When trying to flash GSI ROM(extension .img) with ADB, after "writing 'system' 1/4..." says
"FAILED (remote: sparse flash write failure)
finished. total time: 19.889s"

Those are my problems trying to flash anything :/
My phone is Huawei P9 lite 2017 PRA-LX3 with Android 8.0