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RIFF JTAG – HTC Desire HD A9191 (HTC Ace) Unbrick, IMEI, CID, ModelID, Simlock repair

by on Jun.16, 2011, under News

16.06.2011   RIFF JTAG – HTC Desire HD A9191 (HTC Ace) Unbrick, IMEI, CID, ModelID, Simlock repair

Resurrecting HTC Desire HD is easy. Phone is auto powered on with USB Data Cable connected to the PC while battery is connected.
Some (or all) revisions of HTC Desire HD boards have JTAG interface disabled (that is enable MARM JTAG Fuse is blown in the MSM8255 chip). In this case the JTAG may be enabled only by firmware itself. This is done by the FSBL loader, so writing to FSBL area is artificially disabled in the DCC Loader code. DCC Loader will discard all flashing attempts into FSBL zone and will respond with success code as if flashing succeeded. In this way FSBL zone is protected while user still can flash full image files seamlessly.
Resurrector will reflash radio’s boot zone (except FSBL area) and will re-write PDA’s SPL to 0.85.0007 version. Additionally to SPL and Radio zones, the zone which contains Model ID is re-flashed too. Thus after resurrection phone will have Model ID = ‘PD9810000′.
There is option to reflash BOOT and RECOVERY zones. If selected, then ClockworkMod Recovery v3.0.2.8 will be flashed.

Please note, if your phone has the FSBL loader damaged and MCU has JTAG FUSE blown then there is no way to resurrect your phone via JTAG interface.

To resurrect HTC Desire HD:

  • Solder JTAG cable to HTC Desire HD JTAG pads;
  • Insert batter and connect USB Data cable;
  • Make sure HTC Desire HD is selected in the list of models;
  • If you use only battery, press Power On key;
  • Click Resurrect button;
  • Wait till software signals a successful operation completion;
  • Disconnect power supply, de-solder JTAG wires;

Now phone is in bootable condition, that is, even if it does not start up normally you can flash it using known flashing methods.

To enter download mode:

  • Disconnect PC cable;
  • Insert battery;
  • Hold ‘Volume Down’ key and press ‘Power ON’ button

Please click “Check For Updates” button in order to download and apply new files. Closing all running application before starting update process is recommended.

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