Migrating from TS-269L to TS-253BE

On my TS-269L, running updated QTS, I pulled out my raid1- disks (2 western 2 TB-HDD’s), and unplugged the ethernet cable. I also deleted the nas on myqnapcloud. I wanted to move the disks to a TS-253BE, as a way of updating the nas.
Realising this was a mistake, and put the disks back into the 269L, and plugged in the network cable. I probably put the disks in the wrong bay (disk1 in bay 2, and vice-versa), and plugged the ethernet in the wrong RJ45- port.
By changing the network port, I finally found the TS-269L back on the network with the fixed IP I originally had given it, but instead of the name I had given, it had gotten a name based on the MAC-address of the network adapter, and when I tried to log on, I was told that the disks would be reformatted.

As far as I understand, QTS stores a lot of things on one of the disks…is that always disk1? Meaning that if I swap my disks around, I might get lucky and have my nas up & running as before.

If one, or both, of the HDD have gotten corrupted by being unplugged and swapped around, what can I do to save the data?

What would be the correct way of migrating to a new NAS? From what I’ve understood, you’d have to back up your data on yet another HDD, and start completely from scratch?
Thank in advance❣️

By moving the disks to the new NAS you migrated the firmware on the disks (QTS is on the disks), that firmware is not compatible anymore to your old NAS and you will not be able to use these disks in the old NAS.

You can save your data by just copying it back from your backups (ALWAYS HAVE BACKUPS!)

Insert the disks into your new NAS again and they should work

Worst case, get an expensive data recovery company to read your old disks (you should have had backups .. much cheaper)

Well, number one, you don’t need to delete one NAS before adding another.

I would open a support ticket with QNAP. See if they can help.

Regarding the current situation, we recommend that you first insert the hard drives back into the TS-253B.

Once powered on and logged in, please manually update to the latest firmware version (FW 5.2.x). Performing this update on the original unit will help ensure system compatibility and data stability before proceeding with further steps.

At the same time, please ensure that all your important data has been fully backed up (if possible) to guarantee data safety.

Thank you for your cooperation!