[Kindle Fire HDX 7" & 8.9" General] derBoNostar:
Hi there!

According to [MENTION=877958]matt_h[/MENTION]eyes I queue myself in here asking a few more 'too many' questions. :)

First of all thank you all for your effort and passion and for giving such a great devices a new live after years of ignorance by Amazon! :good:

I'm an occasional long time lurker and you guys already made me succeed in installing HDX Nexus ROM via Rollback -> Kingsroot -> Safestrap almost two years ago.

Now I'm back on track checking out new possibilities to renew and powerup my good old Thor.

But currently I'm stuck in an unrooted SafeStrap-packed FireOS 4.2.5 with deleted SafeStrap on factory reset and I'm struggling with my Thor how to proceed with unlocking and which route to go.

so 2 years ago I did something like https://xdaforums.com/showpost.php?p=63852942&postcount=452

on checking back recently I found out about https://xdaforums.com/kindle-fire-hdx/general/thor-unlocking-bootloader-firmware-t3463982

thought it was cool and worth a try but then I discoverd https://xdaforums.com/showpost.php?p=73864160&postcount=648

and was more like "nah... keep it up with Nexus and go for the updated version without the unlock hassle"

(...guessing that this was probably my major mistake...)

I figured that I need to be on FireOS 4.5.5.1 to have a better experience on new Nexus because of an updated kernel

so I tried https://xdaforums.com/showpost.php?p=68454908&postcount=341

I finally completed step "remove Safestrap recovery and unroot device"

and failed within step "check for updates; it should find and process the 4.5.5.1 update downloaded in a previous step"

Thor showed of an error saying "update not completed, update file not valid" although I downloaded the stock 4.5.5.1 from Amazon's URLs provided in https://xdaforums.com/kindle-fire-hdx/general/update-1314-4-1-1-probably-sangria-t2901813

several suggested Factory resets didn't help so I'm stuck in between and don't know where to go now...

WiFi is still not configured and I guess I have several options now:

re-root again with KingRoot/(SafeStrap) but still on FireOS 4.2.5 ? (Cheers to [MENTION=877958]matt_h[/MENTION]eyes regarding similar concerns)

re-consider unlocking by following https://xdaforums.com/kindle-fire-hdx/general/thor-unlocking-bootloader-firmware-t3463982

to do so root is prerequisite so again there is KingRoot like in https://xdaforums.com/kindle-fire-hdx/general/thor-4-5-5-2-easy-to-root-unlock-t3571240

on the other hand root may not be needed for unlocking when following https://xdaforums.com/showpost.php?p=71610680&postcount=5

Assuming that 4.5.5.x will be needed anyway to be a happy Nexus user, I'm confused...

can I simply proceed with stock OTA-update (SafeStrap is already removed) without a brick even considering the already experienced "update file not valid" error?

will I need the mentioned TWRP-enabled 4.5.5.2 from https://xdaforums.com/showpost.php?p=72334607&postcount=74 which seems to be no longer available?

or may Lineage be worth a try and then there's no need for such 4.5.5.x-considerations?

Sooo... To sum it all up: I guess I'm totally lost in threads here... :laugh:

Will probably need some guidance to see through again and appreciate your help!