I was unable to flash stock rom update(.ozip file) via TWRP recovery. I was also unable to flash stock recovery as any solid download tool was not available. I was also unable to retrieve the ota downloaded in /data partition(/data/Colouros/Ota), if I could that then using ozip decrypting tool, I could have converted the ozip to zip. What I did at the end I locked the bootloader back again which then wiped everything including twrp. I had to presse volume down button while it showed "Can't boot as the image is destroyed...". Finally the device booted me to the initial set up screen and the stock recovery was restored.
This process will erase everything in internal storage.
I posted this as I could not find anything with the link to restore stock color os recovery. I hope it might help somebody.
This process will erase everything in internal storage.
I posted this as I could not find anything with the link to restore stock color os recovery. I hope it might help somebody.