I just tried to flash 5.3 and 5.4 english (EU) firmware to my Chinese camera (CCCH letters in the serial No), which had original 5.2 firmware.
I was not aware of R0 cameras' update issue.
Thanks to Alastair to save my camera.
Hi!
I was able to unbrick my DS-2CD2232-I5 camera and update it to 5.4.5 based on your description and youtube video.
I really appreciate your work and help.
Thank you.