Hi,
For the pop-up issue on Verizon, it’s known issue on 4.13 Release note.
For the third device, please unplug the power for a few minutes and then power on device. Could you describe the led status?
To enter Recovery mode, please connect Ethernet cable from your PC to RV50 ( set your PC’s IP = 192.168.13.x), and follow the steps in “41113547_ALEOS 4.13.0 Software Configuration User Guide for AirLink RV50_r1” document.
Which step did you fail?
Thanks,