It's also technically possible. zumo 390 has two possible PCB PNs of 105-01973-00 and 105-1973-01. Both are also in 395's firmware. Follow the tut in Post #4 of the 590>595 thread substituting the firmwares and relevant HWIDs of course. If you're not sure what to do then ask and i'll post tailored instructions specific to 390>395. All at your own risk of course.
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