No Fastboot? No Recovery? Nothing on screen? Only BROM?
angelican_global_images_V12.0.8.0.QCSMIXM_20210608.0000.00_10.0_global_49908110d5.tgz
it must be file with this name
Xiaomi_Redmi_9C_No_Auth.zip
mtkclient
SP_Flash_Tool_v5.1804_Win.zip
MTK Driver
Python
There is possibility for erasing IMEI so be carefull
(Optional) Backup whole phone using mtk_gui.py Read function before
Step 1. Download all the things
Step 2. Extract files
Step 3. Change dir and sub-dir names from angelican_global_images_V12.0.8.0.QCSMIXM_20210608.0000.00_10.0_global_49908110d5.tgz to something shorter like iwasted7htofixit
Step 4. Open SP Flash Tool
Step 5. Select Download-Agent from Xiaomi_Redmi_9C_No_Auth.zip
Step 6. Select Authentication File from Xiaomi_Redmi_9C_No_Auth.zip
Step 7. Select Scatter-loading File from angelican_global_images_V12.0.8.0.QCSMIXM_20210608.0000.00_10.0_global_49908110d5.tgz
Step 8. Select Firmware Upgrade instead Download Only
Step 9. Open cmd in mtkclient dir
Step 10. Press and hold all buttons on phone
Step 11. Use mtk.bat payload in cmd
Step 12. Connect phone to pc then wait for mtkclient to exploit it
Step 13. Click Download Button in SP Flash Tool then wait for flashing to be complete (if flashing not starting just disconnect phone and connect again)
Step 14. Enjoy working phone
YY_verum goat from xda who found correct SP Flash Tool Version and Stock Rom Version
bkerler for mtkclient