Darwin 6 firmware question

Hi - I own a Darwin 6 and just replaced my battery after about 3 1/2 years of use. I followed almost all of the battery replacement threads in this forum and they gave me all of the info I needed to successfully replace the battery. Unfortunately, I didn't think to take any pictures while I performed the replacement.

Now I have discovered that there was a firmware update for my Onyx Boox device in 2022 that I missed and the build version is 2022-01-20_20-19_2.1.2_5b90d57, but the download is no longer on the Boox website. The url is https://onyxboox.com/support/boox_darwin6 but of course the firmware link gives me a 404 error.

Does anyone have a copy of this firmware download?

Thanks for your help!