unable to reset or recover wAP ac LTE kit

I have a new to me RBwAPR-2nD&R11e-LTE that I was able to power on once, connect to it’s broadcasted SSID for initial configuration, and then I was never able to connect to it again. Resets did not work, nor did my attempt to recover using netinstall. Below is a summary of my troubleshooting. I would appreciate any advice. Thanks.

MikroTik RBwAPR-2nD&R11e-LTE Netinstall recovery attempt (Windows host) — BOOTP seen, Netinstall doesn’t detect device

Device: MikroTik RBwAPR-2nD&R11e-LTE (wAP R + LTE)

Known RouterOS on device: 6.48.6

Goal: recover via Netinstall, then update RouterOS

Setup

  • Windows PC connected directly to MikroTik ether1

  • Windows Ethernet IPv4 set static to 192.168.88.2/24 (no gateway/DNS)

  • Netinstall run as Administrator, Net booting enabled, Boot Server IP set to 192.168.88.2

  • RouterOS package available: routeros-arm-6.48.6.npk

Reset / Netinstall mode attempts

  • Followed the manual reset timing for Netinstall/Etherboot (hold reset during power-on; release at the ~15s stage when the status LED is expected to turn off).

  • On this unit the non-port LED near the power LED behaves solid → blinking → off during the hold; released at the “off” point repeatedly. (Note that this is not consistent with the manual, which says it should be blinking → solid → off

Observed behavior

  • Link is up (Ethernet LEDs show link/activity).

  • Netinstall never shows the RouterBOARD / never lists any PXE client or device to select/install.

  • Packet capture confirms the MikroTik sends repeated BOOTP boot requests (source 0.0.0.0 to broadcast) and the Windows host sends BOOTP replies from 192.168.88.2, but Netinstall still does not detect/list the device.

Current status

  • Unable to get Netinstall to display the device and therefore cannot push an .npk install.

Check this:
https://tangentsoft.com/mikrotik/wiki?name=Run%20NetInstall%20in%20a%20VM