4G-IOT how to unlock fastboot?

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Hello I'm looking easy method to unlock 4G-IOT fastboot mode. It is really difficult because board is missing volume Up button to confirm fastboot oem unlock.

Currently workaround I found is to recompile LK without confirmation and adb dd it to over orginal LK then do unlock and use SP-flash to restore orginal LK.

Broblem is that LCD driver is missing in LK and kernel sources. Correct driver is jd9522_hd720_dsi_vdo_qc.c or ili9881c_hd720_dsi_vdo_cpt.c found in android 6 LK file.
So result LK dosn't use LCD and dosn't boot posible wrong kernel commandline. But fastboot oem unlock can be done. If you need that you can find my compiled LK:
http://ns2.eerin.fi/downloads/