Lenovo A7010a48 Marshmallow update help

hello... i have been searching about that but didnt find anything
i have Lenovo A7010a48
2gb Ram
32gb memory
i have unlocked bootloader and installed TWRP Recovery
for now im still in android 5.1 and want to update to android 6 M
is there anyway to do that without loosing Root or Recovery ??

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