Hi,
Recently I updated my hEX to 6.40.5 and it stopped working. I had to do a netinstall to recover it.
When I wanted to restore a backup I found out that I couldn’t. I tried different backups, from different periods, and none of them are working. I even tried different rOS verions(6.40.3, 6.40.4, 6.40.5).
I don’t know what’s happening, but I have to have it running ASAP.
Try the export (.rsc) file if you have it.
I generally use the .backup file just for the same hardware, and running the same version that backup was generate.
I know and try it with 6.39x to restore the backup. I get always get the question to provide a password for the backup which I can’t provide bacause I did not set it.
Type the admin password
Password you need is the password of your account as login with full privileges.
A recovered device does not have a password set. Then if you use the old admin password it is not always accepted. I find it always a challange when I have a crashed 750Gr3 to recover and restore.
There is no password In the factory default. And backup password is admin password.
I don’t have admin password because it’s new config. On old config I didn’t have a password either, I just set “allowed address” for an admin account.
My backups are not encrypted
I think I have read before that it does not work when there is no password. Not sure.
I don’t have passwords at all.
On the previous config, I had accounts with passwords, but it’s not working when I’m typing them in.
Previously it was working, I was able to restore backups which were not encrypted, but right now I cannot.
i prefer export in .rsc file because its a notepad editable text file
i only use backup file to and from same device and same ros version
for specific test scenarios i use backup, but for production i always use rsc export, and paste manually section by section on terminal to spot any possible errors and correct them before causes any issue
In the past I also used .rsc files but that does not works since almost a year. Conflicting this, conflicting that and is not what you want see when you’re busy restoring your internet connection.
I now expiicit tick the box that I don’t want to encrypt my .backup file and my surrounding tell me that I am a more relaxed person since then. 
Important: when you try to restore from rsc files by cutting/pasting them in a terminal window, make sure you don’t start from default configuration.
So do a reset without default configuration and paste the rsc file via a mac-telnet connection.
So nobody knows how to restore that backup?
Try different versions of routerOS and be persistent. And contact Mikrotik support if you get fed up.
If I remember well then you can restore a .rsc file during restart with erase and should work but .rsc file is not loaded…
I now use solely the .backup files not encrypted. Don’t forget to tick that box.
It does not work due to a race condition but you can fix it by putting a pause command at the top of the .rsc file before you upload it to the device.
Hopefully that pause command will be integrated into RouterOS soon because this is a nasty bug that is difficult to track when you don’t know about it.
(I have once tried for an entire afternoon to restore a .rsc file that way on a router without serial port)
Thanks and I didn’t knew this. Who knows, some day I can change my signature here to something more positive.