@mmain
It depends of course whether you're presently running the latest version or not. If it's the latest then a downgrade might fix it, if it's an older version then an upgrade is appropriate, far less risky and much easier. Please supply answers to all 3 questions below as fw manipulations can be a little dicey and certainly more so without knowing some history of the device.

  • Did you do a fw upgrade just before these RTL errors started?
  • Has the DA50 ever been cross-flashed? e.g. APEC device had US/EU fw loaded or vice versa?
  • What device do you have, US/EU (HWID 2270) or APEC (HWID 2596)? Look here to check: [Only registered and activated users can see links. ].

I have only one old version of US/EU (V5.40) as well as current US V5.90 & APEC V2.70. it's more difficult to find older versions since [Only registered and activated users can see links. ] went offline.