[chirp_users] Duplex off with Baofeng uv-5r8w

Hi

I a am trying to block TX in a frequency on two Baofeng UV-5R8W radios  I have a UV-5R +plus that works as expected with duplex set to off. The two UV-5R8W that display all 6's in the frequency and locks the radios in the transmit mode unit powered down, upon restating it works fine, unless I try to TX on the duplex off frequency again. All three radios have BFB298 and 210223 firmware display. Chrip display HN5RV01 as the firmware. I am using the radio model UV-5R on the UV-5R+plus and using the BF-F8HP model for the UV-5R8W radios.

Thanks for any ides on how to get the Duplex off to function as a TX block.