UR22 (2014 year model) and ipad air2

My older UR22 device is not working with iPad air2 connected via apple original camera interface (1xUSB A, 1 x Lightning port) with original ipad air2 (12W) power adapter.

white led “USB” on front panel of UR22 is blinking. Normally when UR22 is connected to Windows PC this white led is permanently ON … not flashing.

It looks like:
a) ur22 has not sufficient power
b) old ur22 is not compatible with old ipad air2

Has anybody any solution/help?

Thanks a lot!