Location for old LYWSD03MMC firmware

[FergusMcMenemie-cnic]

I have a LYWSD03MMC with Hardware TB03F V1.0. I am think it had been running version HSoftware Version: 5.2 for a year or so. It worked great with Home Assistant.

However, in passing, while setting up another LYWSD03MMC I noticed it's firmware was a release behind. So I flashed the firmware to "Hardware Version: TB03F V1.0, Software Version: 5.3", this seemed to be working and connected to Home Assistant but its display was blank. After lots of googling I came to the conclusion that combination of TB03F V1.0 and Software Version: 5.3 did not work. But there seemed to be no way to downgrade. But lots of more messing around I managed to install "Original_OTA_Xiaomi_LYWSD03MMC_v1.0.0_0130" and the display now works. However it wont work with Home assistant, and I cant properly connect it using TelinkMiFlasher.

The "Original_OTA_Xiaomi_LYWSD03MMC_v1.0.0_0130" version I now have installed prompts me for "Device known id:", "Mi Token:" and "Mi Bind Key:" when using TelinkMiFlasherV1.2.3. I am not sure what this is about. Luckily I had saved the original "Mi Token:" and "Mi Bind Key:" but re-activating does not seem to do much.

Is there some path back to the Software Version: 5.2 to get it working again.

[pvvx]

Why did you program a version for another device (TB03F)?
Install the LYWSD03MMC firmware via OTA in TelinkMiFlasher.

[FergusMcMenemie-cnic]

I installed the "Software Version: 5.3" as suggested by TelinkMiFlasher. Which then broke my display.

After lots of resets the LYWSD03MMC, now running "Original_OTA_Xiaomi_LYWSD03MMC_v1.0.0_0130", finally appeared in TelinkMiFlasher but there was no suggested firware options. Looking at another LYWSD03MMC using TelinkMiFlasher + browser debugger I was eventually able to deteremine the URL for the firmware images I needed. I downloaded the ATC_v52.bin I needed and flashed it. All good now.