Download Videocon V504730 (V50MB) Delite 21 official stock firmware from the link here, and follow the provided flashing instructions to learn how to flash the stock rom.
If you notice that any of the links provided below is broken or doesn’t work, please post in comments section so we fix and update it ASAP.
Download Options
File Name: Videocon_V504730_506_91_V1.0_ V50MB_M87945_Cf45a_20170228_ 35PM35u_16G2G_DDR3_FWVGA_ G4W18L13740_ALS_21 1246_ OTA (1).zip
Size: 1 GB
Firmware – Download
File Name: V50MB TP SW (STEP 3) Videocon_V504730_506_91_ V1.0_V50MB_20161207.zip
Size: 1 GB
Firmware – Download
How to flash
After downloading the Flashtool firmware, follow the instructions here to flash.