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Rusty Dekema rdekema at gmail.com> Given your interest in the 850 MHz band, I gather that you must be > somewhere in North America. Anywhere near Southern California > perchance? North America, yes; southern California, no. I'm in southeast Michigan, 30-some miles from Detroit. > Is it "official" PCS1900 support, or are you seeing some of the > received RF energy in the PCS band (in a very strong signal area, > presumably) seep through the imperfect 1800 MHz SAW filter with the > antenna switch set to DCS? That is a very good question. I am not sure yet. I will email either you or the list again when I know more. > If all else fails, I reason that one should be able to disassemble the > phone, desolder the flash chip, reprogram it with a known good boot- > loader using a standalone device programmer, then solder it back onto > the board. But I'm guessing that flash chip is probably a micro-BGA > (IIRC it's a flash+pSRAM MCP), so it wouldn't be a home soldering job, > but rather something to be sent to a professional lab. If you fancy > going down that road, I would suggest talking to Technotronix in > Anaheim, California - ask for Gopal, and tell him you were referred by > Michael S. from Harhan. I suspect that would cost more money than I am currently willing/able to spend on this project, but I appreciate the reference and will keep it in mind. > Would you mind telling us which branding it is? It seems that Cingular > units have bootloaders that work out of box, for Tracfones there is > another method that has been proven to work, so what other brandings > are out there? Mine is Cingular branded, but it has software version 1.9.24 instead of the seemingly better-known (and known to work) 1.0.24. > It appears that what this tool does (at least on Tracfones with V8.8.17 > firmware) is it erases and rewrites the first 64 KiB sector of the > flash. The new bits written into this sector appear to be contained > as a 65536-byte payload within the mot931c.exe binary; and it looks > like whoever wrote this tool replaced the first 8192 bytes with a > "good" C139/140 bootloader, while leaving the remaining 56 KiB > unchanged from V8.8.17 firmware. So the phone ought to retain its > firmware unchanged, but gain the ability to break into the bootloader > like we are used to doing. But apparently the firmware checksums > itself, as doing a normal boot (w/o serial download) results in a > message on the LCD (with the backlight off, so hard to read) about > the firmware being corrupted or something to that effect. Very interesting, that is good to know and will come in handy if/when I get my hands on a Tracfone that it works with. Cheers, Rusty