[HD7 General] androidunia:
Ok,

I read through all the related articles and tried to downgrade my TMOUS HD7, firmware as below and I believe all other users for TMOUS have same as me if update firmware normally....

So I only re-arrange articles posted by Devs to here for not to confuse....for novice users just like me !!

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OS : 7.10.7720.68

FW : 2250.21.51004.531

HD : 0002

RADIO soft : 5.71.09.02a_22.51.50.21u

RADIO hd : A12.0.D4

BOOTLOADER : 5.10.2250.0(132968)

CHIP soc : 2.2.5.0

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PD28110 SS-BC(4K)

SPL-5.10.2250.0 (132968)

MicroP (LED) 0x07

Touch S1 (V1.8, #1624)

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I have tried below ;

[SLSPL]HD7 HTC_Europe Stock Limited SPL ROM to downgrade >=5.10.x Bootloader by ansar

But not working for me as, maybe, my HD7's bootloader is locked only SIM unlocked. It stopped after starting flashing but no affect, no brick.... so it worth to try..... (Well, in my case....)

So only one and last choice for me to take a risk was Goldcard method by viperbjk..

Problem I was faced...

1) No 1G SDCard. (Damn! difficult to get ~~)

2) No SDCard Reader can be recognized by HD7 when I connect to Y-Cable together with HD7.... I tried 4 card reader and non of them were working..

So how I did without spending more money and time~~

2G microSDCard (SanDisk), get CID with android phone and make goldcard.img as instructed by here and save created goldcard.img to notebook.

Delete the whole partition of microSDCard and create FAT 32 partition for only 512M as a primary, leave as unallocated partition for rest of the space with using "EASEUS Partition Master".

Put 512M partitioned microSDCard to notebook and format FAT32, 4096 byte using Window explore.

Make Goldcard with saved img file and copy this goldcard.img file and "SCHUIMG.NBH" after changing the file name from "RUU_signed.nbh",which I got from here for TMOUS (I choose TMOUS NoDo Rom) to microSDCard.

Power off Xperia X10 and put Goldcard microSDCard into Xperia X10, boot to CWM recovery, select as USB storage and connect to Y-cable then connect HD7 after boot into USB Host Mode to another USB conncector of Y-cable but doesn't go forward after "Loading......" message on white screen.

Took out microSDCard and put into HTC Wildfire and did same as X10 but nothing happened. Worse than X10... HD7 even not recognize at all, not even to show "Loading...." screen.... (Here, I assume that POWER IS NOT ENOUGH....)

Put microSDCard into HTC HD2 and boot to Magldr recovery, select Mass USB storage and connect HD7 on USB host mode to another USB connector...

And OMG !!!!

HD7 recognize microSDCard as soon as connect to USB connector of Y-cable and flash very fast ( just single reboot and straight to completion).

So, conclusion, as a case study.....

For who has additional android phone...

You don't need to sensitive for Y-cable... just normal sync cable will work, even without soldering... just peel off to expose copper wire 1~2 cm for each cable and join / twist tightly.

microSDCard 2GB can be used... to make sure, just make a partition for 512M.

I assume that android phone's own power supplying is important to be recognized by HD7 as a USB mass storage (but maybe because of CWM and Magldr ??? I am not sure about this..) ..... when I connect SDCard adapter to one end of Y-Cable, it was not working... should blink the light but nothing happened (This is because of lack of power...) and of course HD7 did not recognize..

Funny thing is,

If connect direct to USB port of notebook, it blinking but connect to Y-cable, no blinking....

I didn't test other size of microSDCard so if someone tested, well it will be good information for other users instead of being crazy to find out "antique" 1G SDCard, I think....

After done, I checked Setting / About then I found out T-Mobile was gone.....

So my HD7 becomes unbranded now ?????

Then I flashed RSPL / HSPL without any problem and flashed straight for custom rom, NO PROBLEM !!!

Appreciate to ceesheim, viperbjk, xboxmod, ansar.ath.gr and other devs... who made my HD7 alive !!!!!