Ok.  Lets try this simpler method as version 2.03 has ability to recover even if the settings asset is missing.   When you put it in update mode, you should see a storage device on your PC called RPI-RP2 with a drive letter like F:.   Copy the SpinnerUltimateV203H2.uf2 file from the download before to the drive root and it should auto-update. it may take a minute.  Once its updated, it should automatically default the settings.  if you get a message on the small screen with something like settings not found, put it in update mode again (press the update switch via the small pin hole on the top as you plug in the device) and the drive will come back then copy the uf2 from this zip file which is the settings asset file I converted for you from bin to uf2 fire to the drive also:  https://www.icode.com/wp-content/uploads/SpinnerUltimateV203H2LFS.zip

So basically 2 steps.   update mode, copy main UF2 file to the drive,  then update mode again and copy the LFS setting uf2 file.

Let me know how this goes.

Then, go to command prompt where you unzipped the firmware update file. 

Type DIR and hit enter. If you unzipped correctly, there will be a .uf2 and a .bin file plus a folder called picotool-rp2040

Now, type this first:

picotool-rp2040\picotool load --verify "SpinnerUltimateV203H2LFS.bin" --offset 0x10fbf000

If above works, then type:

picotool-rp2040\picotool load --verify  --execute "SpinnerUltimateV203H2.uf2" --force

That should do it.

Step 1 of 2: Upload Assets:
ERROR: The RP2040 device returned an error: <unknown>
.
Step 2 of 2: Upload Firmware:
ERROR: The RP2040 device returned an error: <unknown>
Upgrade done

this "update" is much more difficult than it needs to be.