I have a VIM4 that I was trying to upgrade to latest Ubuntu 22.04 image from June 20th.
I was not able to enter OOWOW using Function + Quick Press Reset buttons. Or through 3 rapid press of function button.
I subsequently attempted to upgrade/re-write OOWOW from SD card as indicated in OOWOW documentation and erased EMMC and tried again when the first attempt failed.
Now I get solid white LED and initial fan spin but can not enter OOWOW, an no longer have access to my Ubuntu installation (this is expected). OOWOW upgrade does not run from SD card. And OOWOW will not run from SD card either.