Why can't I switch between devices?

Hey everyone, first time asking here, thanks in advance...
I have A Z10 t-mobile just got the Z30 factory unlocked, for some reason I can't switch devices using the BlackBerry Link, I tried backup and restore and both devices plug up at once, the Z30 OS is newer than Z10, about half way through transfer an error will pop up saying check device if turn on and connect to BlackBerry Link. The device is on all time, but seems to stop reading..... when I checked the Z30 most media and some setting are transferred but no apps are golden over....... I tried about 10 times same results...
I've transfer BlackBerry before multiple times no big issues then....
Sorry for the long explanation just wanted to make it clear.

Any help Appreciated
Thanks
Seiko.

Try doing it in two steps.

Do a full backup on the old device. Unplug.

Connect the new device. Do a restore from the backup you just made.

Make sure you've used the same BBID to setup the new device.

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