Background, I have Xbee3’s from the Digi Mesh Kit working USB hub and Windows 10 using XCTU.
I have installed an XB24CZ7WITB003 in the Explorer board and connected to USB. Red light on board goes on. Windows and XCTU find the COM port. XCTU doesn’t discover the Xbee. I see some configuration issues here:
I’ve used the Explorer board with both the XB24 and current XBee3 modules. Getting the software connection established has almost always been pretty easy. However, I did recently have one give me problems though it was a little different that described in the OP (mine was found by XCTU but wouldn’t load or accept any settings/commands). I wrote to Digi support who suggested pushing in new firmware [as described in this link. I had to try it a few different times but it did eventually solve the problem.](XCTU User Guide)
See the exchange on Nov 15, 2017, in the replied answer.
This works, but needs to be repeated every power cycle:
(a) Connect with terminal over USB
(b) Press +++, etc until a menu appears that has “B-Bypass” as an option
(c) Press only B key, don’t follow the Enter, etc
(d) Exit terminal simulator
(e) Run XCTU
(f) Connect as usual, it found board at 115K baud, could configure and Write
There is also a way to do the bypass mode from XCTU, using Tools > Serial Console. A work around that I saw (no link) was to write a program for the HC8 to automatically convert to Bypass mode.