Noticed now that you probably mixed the Retevis names, I guess you really wanted RT82 which use the same hardware as MD-2017
https://www.sa0bux.se/Ham/RT82/
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This was for RT84 = DM-1701
I have some here:
https://www.sa0bux.se/Ham/RT84/
2.03 was the latest FW I found then, the 1.05 zip is the CPS.