Hi, I can't upgrade RB112 (ROS 2.9.24) to 2.9.50. When I put new package (.npk) in files directory on RB and do reboot, system won't stand up. After switching POE off and turn on again, old ROS is running. I try this on another 112 and same thing is happening, even when I try to downgrade to oldest ROS.
How can I upgrade ? Any other way ?

first, is your license current?

second, are you using the correct version? (rb100 series)

lastly, try dragging and dropping the npk file from your desktop to the file section of the winbox session on the board you are upgrading. Wait until the size reports correct, then reboot.

Yes, I try drag and drop and same thing.
Yes, version of .npk is correct, for rb100 series (same for rb500 too)

That is odd. Do you have the reset jumper on? Have you tried upgrading via a web page at the url of the MT?. There is an option to upload and upgrade there.