Hi thanks for removing my serial number publicly.
I have not got any idea what the previous modem firmware number was.
Back in December 2020 I made this note
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Firmware version currently installed in the device. RUTX_R_00.02.05.2
Firmware build date 2020-11-19 15:36:33
Modem firmware version N/A
Kernel version 4.14.171
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But since then I have upgraded the device again.
RUTX_R_00.02.06.1
Kernal Version 4.14.195
Internal Modem Model EG06
FW Ver: EG06ELAR03A05M4G
I upgraded due to slow mobile connection speeds and intermitant disconnects.