Help build the Qin F21 PRO Ultimate Guide

Nooch · March 27, 2026, 2:05pm

Yes

ars18 · March 27, 2026, 2:05pm

I was asking @A.I.V

U trying to unbrick a phone? What’s the goal?

A.I.V · March 27, 2026, 2:14pm

Yes, I mean signed.
Currently, I havn’t broken phone. but, I want that I can to fix.

ars18 · March 27, 2026, 2:18pm

I would just either pull your current firmware and resign it, then it can be flashed with spflash, or patch one of the older firmware like 1.0.8 to work with V2 and sign it.

Replace images in signed package and use original scatter.

Both guides available on the forum.

https://forums.jtechforums.org/t/guide-fix-new-batch-f21-pro-speaker-issue

https://forums.jtechforums.org/t/lock-bootloader-with-custom-firmware

Then upload for ppl to use

Zvi_Wolf · March 31, 2026, 3:18am

is there a definitive way of knowing from a serial number? the “ultimate guide” only shows one new serial number…

yossii · April 14, 2026, 12:38am

i want to buy 3/32 and i want to know which version to buy to be able to flash it

i can buy PC25 or MQ25 which one???

yossii · April 14, 2026, 12:40am

and also is threre any Other version except the PL that is possible to flash?

dfrydman · April 15, 2026, 6:04pm

what do you mean you can buy “i can buy PC25 or MQ25 which one???“
you found a seller for the PC or PL version

FlipAdmin · April 15, 2026, 8:30pm

Where is everyone buying their F21s these days?

Shalom_Karr · April 15, 2026, 8:36pm

New version or old?

Nooch · April 15, 2026, 8:43pm

It’s very hard to get the old version you have to have to seller to send you the serial number and if it’s the old version hope that he ships you that one

FlipAdmin · April 15, 2026, 8:55pm

New. I need a new one for my lineageos project.

Zvi_Wolf · April 15, 2026, 10:05pm

Aliexpress

Nooch · April 15, 2026, 10:07pm

@dfrydman is looking to get rid of some of the new version type

dfrydman · April 16, 2026, 6:34pm

@FlipAdmin I have brand new - new version of qins I would sell for much cheaper than online.

you can contact me if you want at 281-691-2421

ealmobl · July 14, 2026, 5:01am

Model: Qin AI Life F21 Pro
Serial prefix: F21PL24 (full serial available if needed)
Storage: 4 GB / 64 GB
Blue USB port
Purchased in Israel
Flashed 3.0.2 GApps with SP Flash Tool and received STATUS_SEC_IMG_TYPE_MISMATCH. Phone now bootloops in preloader. MTKClient reports SBC=False, SLA=False, DAA=False and can detect the MT6761 when it connects. Which stock firmware should I restore?

any ideas or leads

RoseStudios · July 20, 2026, 2:42pm

I just picked up this qin from alibaba, not sure what version it is, i am unable to enter brom, just the preloader. It has an orange usb port but old boot image.