SX 56 change frequencies on xda rom

[ms-preacher]

Can't switch frequencies to 1900 to use phone in central US. I push 1900 and it says error and goes back to 900 which does me no good.
What can I do?

[Biso007]

What RSU version ?

Do you do this in phone settings or GSM band switcher in boot loader ?

[ms-preacher]

Not sure what you mean by RSU, but I have the XDA special edition rom 3.17.03 eng and I am doing it in the phone, I don't how to start bootloader. Thanks.

[Biso007]

RSU stands for the Radio Stack of the device (the phone thing) ... you can read it in device info ... and if it doesn't support 1900 MHz then it's useless to try it from the phone settings.

Also, your device must be PW10B to work in 1900 .. check the rear sticker

you can start the boot loader by pressing and holding power while soft reset ... then press calendar button to go in the GSM menu.

[ms-preacher]

Got into the bootloader and set to 1900. I have a PW10B1, but device info says I have a PW10A1. Why is this. The phone will now pick up a signal on 1900 but the reception is poor. Looses signal where it used to have a signal.
Radio Version is A.33.02
ROM Version is 3.17.03
Do I need to get a different ROM to get it to match a PW10B1?
Also, can I put my old ROM back on? I have it on disc? Tried to reload from Siemens site and it said I could not load on to this device.
Thanks, you have been very helpful!

[Biso007]

It seems you used the 3.17 ROM to unlock ... what was the original ROM ?

well, I 'm the last one to advice on RSU flashing ... it's risky unless really really necessary ... check with your friends in the same area on the best RSU ... ROM doesn't make any difference.

If ok, I would recommend ROM 4.01.00 with RSU 6.25.02 ... you can cook the ROM in the kitchen but leave the RSU action as a last option

[ms-preacher]

Original ROM A30.09 ENG
Radio A33.02
Since last post I figured out how to use XDA tools to get Siemens upgrade ROM back on and now every thing seems to be fine and unlocked which is what I originally wanted to use with Cingular sim. I will have to roam on ATT to use this but is OK since I have free roaming.
If I have any more problems, I will post again.
Thanks!