I have come many times here to root my phone and I did success, thanks to you.
But now there is a new problem and I did not find any solution, then I will try to explain with my bad english what I did :
At first I tried to flash TWRP (an unofficial one many said it was working) on the phone after unlocking the bootloader, SP flash tool said it was successful.
But it was not, after reboot former recovery was still there, not TWRP (does anyone knows why it did not work ?).
I tried to install Lineage, which bricked my phone. After the debrick, I installed Android 10 GSI, and it worked but impossible to use MTP, Bluetooth or to download with the HTMLViewer (in other words, the system was unusable).
Then I reinstalled the ROM provided by Blackview, and installed Magisk, rooted the phone, also suppressing all the Google stuff it was possible.
And there is the main problem : I think I erased the NVRAM while unbricking the phone and then I have got an overlay of red chinese caracters on the corner of the screen. I tried to replace the original IMEI and MEID successfully with MAUI Meta, but chinese caracters are remaining here.
A screenshot of the ugly writings : https ://ibb.co/bWWp1wr
My phone is a Blackview BV9500 Plus.
Any suggestion about how to remove them ?
Thanks in advance !