Sik radio: cannot enter bootloader mode, solid green and red LED

I have a problem with the old 915MHz Sik Radio not pairing, old MP fortunately can update the firmware from 1.9 to 2.2.

After updating successfully, both units are still not paired with the same NetID (blinking Green LED), It is the same usage scenario on 433MHz newer modules, not sure what the issue is, does anyone have the same experience, please share your solution.

these conditions are satisfied.
For two radios to communicate the following must be the same at both ends of the link:
the radio firmware version
the AIR_SPEED
the MIN_FREQ
the MAX_FREQ
the NUM_CHANNELS
the NETID
the ECC setting
the LBT_RSSI setting
the MAX_WINDOW setting
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