I have asked similar thing once. No answer!
Mikrotik devices can't be downgraded below factory-software version, which is the current ROS version at the time of manufacture.Did you contact support with this question?I disassembly older n younger hw, n they both have exactly the same hardware. They prevent downgrade for what purpose?
Same with 6.46.2. Tested with two different hAPac^2s.Already more than 50 pcs installed with last stable version 6.46.2 and all of them works good! Tested all of them and all CPU works!
Absolutely the same with 6.38.3. I tested again. There is no working ROS version!Go back to 6.38.3 and all will works fine... (close service ports for avoid vulnerabilities)
Please refer to #103Can u record a video for this. I think if u do this Mikrotik will relate the topic.