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WIC Reset Program and Chipless Firmware
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WF-7720 Firmware Downgrade Not Working

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i cannot downgrade my WF-7720 [FA27K7] to version [FA27HC] in NORMAL MODE:
i did my best on the manual but the printer does not restart [i wait 2 hours, hangs up]
i unplugged the cable and after 5 minutes plugged in: => starting Recovery Mode
i have reinstalled the firmware FA27K7 with "wicreset recovery firmware" in recovery mode <= this works

i receive an error message: ROM IS NOT WRITABLE

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