PLEASE HELP With New Version of the Qin F21, Different Hardware and ROM

Phones Qin F21 Pro
733

im willing to chip in to pay for a professional

1 Like
734

@Mark_ostreicher @dfrydman @ys770 @Lamden613

Disabled SPB filtering in md1img, and added US band support (as far as I know…)

Please try:

fastboot flash md1img md1img-us-bands.img
fastboot flash nvdata nvdata_F30_US_REGION.bin

Then check in engineer mode for bands

Even if they show up, they may not work properly. Would help if I had a USA device firmware for another phone, so I can see the RF calibration data.

1 Like
735
736

Can Modem Meta generate calibration data? Never used it.

737

This might use the same RF chip, I’ll check.

TCL-5007Z-T-Mobile-REVVL-4-LTE-US

738

nope, it’s mt6177L, not M

739

Anyways… Please try the above:

740

china is now sold out of the old board for both black and white, 32GB and 64GB….
There may be one or two suppliers that still have….

741

Wonder phone? You told me it’s 6761, you think it’s same? With same frontend RF? Who knows

1 Like
742

cpu is 6761

743

Well… I wonder if they would be upset… I should stop wondering, they’d be upset. Lol, not happening.

Need RF config for LWTG_6177M_R3_6761

1 Like
Qin F25 USA?
744
AI

LWTG_6177M Build = China Market Only

Build code breakdown:

  • L = LTE
  • W = WCDMA (3G)
  • T = TD-SCDMA (China-only 3G)
  • G = GSM (2G)
  • 6177M = RF chip variant

TD-SCDMA is exclusive to China - no US phone would ever have this.

Comparison:
┌──────────────────────────┬────────┬─────────────────┐
│ Build │ Market │ TD-SCDMA │
├──────────────────────────┼────────┼─────────────────┤
│ LWTG_6177M (yours) │ China │ ✓ Yes │
├──────────────────────────┼────────┼─────────────────┤
│ LWG_AGO1_6177M (USA F21) │ USA │ ✗ No │
├──────────────────────────┼────────┼─────────────────┤
│ LWCTG_6761D (REVVL 4) │ USA │ ✗ No (has CDMA) │
└──────────────────────────┴────────┴─────────────────┘
The Problem:

Any phone with MT6177M + US bands would have a LWG build (not LWTG), which means:

  • Different modem firmware structure
  • Calibration may not be directly compatible
745

Why do they care if you make it work in America it gives them more sales

746

It’s not about caring

747

They changed the new phone for a reason

748

I’m talking about like qin in general

They should allow US bands they’ll get more sales

749

its not just that
as they also released it with a locked down ROM

750

That’s every f21 stock ROM

751

no
this one had adb install blocked etc
and the other things that had in build.prop…..

752

All like that :slight_smile:
Check the other stock roms