D-Link DGS-1210 stuck on Openwrt

Hi, I installed openwrt on my switch
model: D-Link DGS-1210-52

And let's put it this way, OpenWRT is not built for switches at all...
And I want to return to OEM firmware but I can't.

I follow this guide: https://openwrt.org/toh/d-link/dgs-1210-16_g1#dual_boot_environment_without_serial_console

The firmware is installed on Image2 but when I try to switch it after reboot, it still openwrt boots up.
I would be happy to help.
I only get the error message: Warning: Bad CRC, using default environment
After the first command of: fw_setenv
I tried also fw_setenv image /dev/mtdblock7 - 5,6,9

At the moment it is not possible to use this switch with openwrt installed on it. (Even in OEM it wasn't exactly possible, but better (: )