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Si e finalmente SONO RIUSCITO A SBLOCCARE QUESTO DANNATISSIMO BOOTLOADER!!!!!
Direttamente dall'autore del post sul Forum XIAOMI Darkhiei:
Finally something changed. Don't know what exactly was, but with this combo I've finally unlocked my redmi 4 pro.
1. Disable signature verification in Windows and started test mode (
[MIUI DEVICE TEAM] Disable Driver Signature Enforcement in Windows 7/8/10 64-Bit - Redmi Note 3 - Xiaomi MIUI Official Forum)
2. Remove installed driver (reboot the pc)
3. Installe PDA Driver (
Download PdaNet+) and connect phone during the intallation
4. Remove device from i.mi.com
5. Sign out account from device
6. Factory reset device
7. In the wizard skip the account login
8. Enable dev settings and turn on OEM Unlock, adb and check Mi Unlock status (login in this step with your account ID, NOT mail or phone number) and get again -1 error
9. login in i.mi.com and find the device
10. reboot the phone in fastboot
11. use this version of Mi Unlocker
Bootloader Unlock - Solution that worked for my Redmi 4 Pro/Prime - Redmi 4/Prime/4A - Xiaomi MIUI Official Forum and login also here with account ID
I don't know if something of this is really necessary, but with this combo I solved. If someone would try only with that version of Mi Unlocker and report the result probably may help someone else.
It was a really exhausting experience.
Ci ha messo giusto 10 secondi di orologio per sbloccare il mio bootloader....sono contento come una Pasqua