Mi4c wont boot twrp anymore

[phon3Adict]

SUMMARY OF PROBLEM WHAT HAPPENED:
1.Flashed an miui 8 stable rom from xiaomi.eu not official rom so it shouldn't lock bootloader.
2.Cant boot into any recovery i just get miui boot up logo then then it turns off.
3.Cant root via kingroot and other root apps ect to flash twrp via flashify.
4. Cant manually enter fastboot due to damaged volume down button not working *(The plastic​ film. On the button ripped off)*
5.Don't know other way to enter fast boot please help!
:crying:

 

[Suxter]

Fix your volume button first

 

[Adi393]

By flashing MIUI you most likely updated your bootloader to nougat, which removed TWRP. You need to apply for xiaomi permission to unlock bootloader and then reflash TWRP in fastboot. If you can't go into fastboot you should be able to use ADB commands or a terminal app.
Edit: Terminal app requires root to reboot so that's not an option. I can't try adb because I don't have access to PC right now.