[MDA, XDA, 1010 General] rybostyle:
The SX56 GSM/RADIO STACK BOOT ERROR is definitely a battery issue, and I

think all of these RSU upgrade workarounds fail to take this into account.

Here's my 2 day hell experience with my SX56, PW10B1 originally AT&T, bought

on Ebay and with the help of this forum, unlocked and flashed new rom

switched to T-mobile with no problems. I used this phone for 5 months with

this Romset, without any glitches whatsoever.

ROM 4.00.21 ENG 8/11/03

Radio 6.12

GSM 324e4

Saturday night I'm driving down the highway, talking on the phone, I get another call, switch over, tell em I'll call em right back, finish my original phone call, go to call the other caller back, and my screen is FROZEN. I pull over and do a reset (soft), no GSM or Radio stack. Phone hangs on boot screen. Only displays ROM# on hanging boot screen.

I get home, do a hard reset, wallaby bootloader 5.15 says GSM ERROR. I reflashed the rom from an SD backup I had saved, still no GSM or Radio stack, but It boots after waiting for 20 minutes. NO GSM, RADIO, OR IMEI# in system info.

The one thing that stood out is the fact that the bootloader had no GSM, so any upgrading of the stack RSU or otherwise seemed pointless, since the bootloader had no idea the phone was even a phone. But I tried those rsu upgrades and got to the 1% screen of death. After 4 or 5 attempts that proved useless, no matter what I installed, then deleted from the

windows/startup folder, IT JUST WOULDN'T WORK.

I was convinced that somehow the chip became physically corrupted, since at the bootloader level the phone was not aware of it's radio, gsm, or IMEI#.

I gave up after many many hours and called SIEMENS tech support monday morning.

I described the problem to them (GSM ERROR AT BOOT) and they told me that the GSM chip needed to be reflashed by them, that there was nothing I could do for the phone to fix it myself.

My phone's build date of 12/02 put it out of warranty, and since I bought it 2nd party (on EBAY) the repair would be handled by their out of warranty department. They gave me that phone number (it's a subcontractor, not SIEMENS that does the repair).

I called them and explained the problem, they told me that this repair would cost $US 215.00. I asked them if they had a special rate since so many people were having this identical problem, no sir 215 is the price. In order to get an RMA#, they wanted my credit card# so that they could authorize the funds (BEFORE RECEIVING AND DIAGNOSING THE PHONE). I told them to give me a day to think about it, and that I'd call back.

One thing I noticed during all of the booting/rebooting was the fact that the CHARGING light was dead. My battery had plenty of power, but the phone was reporting battery status "UNKNOWN". When I switched between cradle power or battery the indicator never changed, simply saying status "unknown".

I had an old nokia cell that I took apart when I broke the charging socket off of the circuit board. I opened the phone and with rubber bands, held the socket on the board and charged the battery with the phone out of it's case.

This got me thinking about the sx56 battery, and I had a brainstorm!

I did a google search for SX56 battery replacement and found

http://www.pdainternalbattery.com/siemensinstall.html

I took the phone apart (TORX #6) and removed the battery. with the battery out and the back off of the phone, I held in the rocker switch that checks if the back is on.

I connected the phone to my PC for power via USB, and it started right up!

The GSM and Radio stacks came back, and the charge light went from off to green!

I put the battery and back on the phone, rebooted and the battery charge light turned amber, the phone said charging. The IMEI # is back, and I put in a SIM and can make calls.

I bet a lot of people are having this battery issue, and when they lose that Radio stack, immediately try to upgrade it.

By removing the battery, my Stack AND IMEI came back, proving that it was never really gone in the 1st place.

I don't know about all of the STACK upgrading, but this worked for me.

Anyway siemens was going to charge US$215.00 to fix it,

and all they would do is open and close the case......