You've to flash the recovery image and then the firmware you want. Check my signature.
You could try to only reset OpenWRT -> https://jjm2473.github.io/nas/2020/08/26/rtd129x-openwrt-1806.en.html#reset-openwrta

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This worked. Thanks
How do I install Transmission torrent or other torrent client?
Is it possible to mount a NAS conected to my network as the drive where to download the torrents?
I just saw that Transmission torrent is in the Services Tab.
How do I configure it to download files directly to my Lenovo NAS?
I do not see the NAS in the list of available devices. I think I managed to mount the NAS as SMB Net Share but now I can't get Transmission to work. I mean I try to download a torrent but it says It can not connect.
How do I resolve this?