Can't netinstall used hap ac2

I bought a used hap ac2 on ebay, but found that the wifi networks were secured “Spectrum2G” and “Spectrum5G”. So I did a regular reset, but the wifi networks remained the same. Seems the OS was modified, so I’m trying to reinstall the os with netinstall, but despite fully following the article exactly with a windows server 2008 pc, it will not show up.

So I start holding reset before plugging it in, usr light comes on for a short while, blinks rapidly ~11 times, stays on for a bit, then goes out. I read about protected bootloader but the light would blink on/off every second if that was enabled?

YAAY got it working with a switch

I can fix the Mikrotik Routerboard
exposed to the bootloader without losing the license. all types of direct proxy in the hardware section immediately sent to me in Indonesia