How can I install custom recovery/root/gapps in Firefly

I have Firefly RK3288 Reload. Need to install custom recovery for root and gapps. Have wasted like 5-6Hours on internet trying different things. But not got anywhere.

Can Firefly be boot into recovery mode? “adb reboot recovery” just restarts it into normal mode. Neither does “adb reboot sideload” works.

Can someone help me here please?

“reboot recovery” doesn t work ?
My FirePrime work with that comman .

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