Jtag Chip Xbox 360

[Stayla Casillas]

Higuys,

I'm usually pretty savvy at fixing these problems myself but I've been searching forums for days looking for a solution that works for me and nothing! So any help is much appreciated.

The problem is as follows, My JTAG RGH (SLIM) turns on but will not boot. It won't boot with HDMI or any other input. The green light goes on, and the cool runner red light is on, but it won't kick in and start the bloody thing. Booting into Xell won't work. Weirdly for some reason every now and then the xbox will boot and run properly. I have tried so hard to understand why, but it seems to just decide to work sometimes. Originally I assumed the xbox was broken and left it for months in storage, then one day plugged it back in, and for a short while much to my surprise it worked. My power brick and supply seems to be healthy. I try with and without internal HDD and external HDD yet it seems to have no effect. It truly seems a miraculous occurrence that it works very occasionally, but i would love to understand why and fix it.

I had a set of Torx screwdrivers, but they got lost when I move house, So i'm unable to open the xbox at this point in time. It wasn't me who installed the chip, It was done for me, but by a very reputable dealer. I would have assumed that if it were a chip/soldering issue it wouldnt work flat out as opposed to occasionally? Or does this sound like a fairly typical soldering issue?

It sounds like a system that doesnt want to glitch to me, but it could be a crap quality chip, or bad wire routing/lengths. Some boxes are harder to get consistant glitch times. Do you know what chip is in it?

Take it from some one who has installed RGH on more boxes then I can count. If it randomly boots at all it is not the nand image. the fact you say xecuter coolrunner that randomly stopped working, makes me think it is a clone chip, as I have never had a real coolrunner not glitch a system, even after a few years. There is also the thought that Swizzy had, and there is a bad connection because the chip moved, I have had this happen on my r-jtag jasper. Long story short, we are educationally speculating on the problem, as we cant see what is actually going on, or use any of the tools, like post monitoring with out actually having the box in front of us.

Hi guys sorry to post on a old thread. But this is the same problem im having. It started out by shutting off randomly, i took it to the guy who jtag/rgh my xbox,he said it it was the faceplate that made the problem, it lasted say about 2weeks, then it shutdowns randomly or refuses to boot up.took it back again not sure what he did. Yet again it only lasted 2weeks, before it didn't want to boot at all. I gave up on it for a while! A week back i got the itch to play again i took my xbox to the same guy(only person i know who does this in our area) got it back and he said something about my timing was way out and he never seen such a thing he also said he reflashed it. Plugged it in and everything was fine, NEXT DAY it didn't want to boot up again only the green dot in the centre comes on with no display,red light comes om at the chip with green flashing...any help please!!!

So whatever code is running on the xenium clones I have does not like anything being on the flash other than their own modified xenium os 1.0. They're still happily recognized by the flasher tool, even after flashing 2.3.1 to them. but I accidentally overwrote the flash.bin when I went to write it back. Learn my ass for not fully reading shit and madly clicking.

The flash.bin BIOS/OS of the modchip and the openxenium.svf file for the FPGA/CPLD are two entirely different types of code for the OpenXenium modchip. (FPGA = field programmable gate array. CPLD = complex programmable logic device.)

openxenium.svf is the firmware loaded to the CPLD. Written to the CPLD of the OpenXenium modchip via the JTAG port on the modchip. Not what you want to use to recover from wiping the XeniumOS from the modchip's flash memory chip.

If you wiped out the Xenium OS and if the flash.bin originally written to the modchip contained the recovery BIOS section, you can enable the recovery mode of the chip and reflash the Xenium OS 2.3.1 to the chip. Or, if not, more about second recovery method later.

If you have another hard modded Xbox (or another working modchip to install into and boot this console) after booting into a replacement dashboard, you can hot-swap the modchip and write the flash.bin file to the OpenXenium modchip by running the Xbox application xenium-tools.xbe available in the releases section at the OpenXenium github.com site.

Clones do NOT have the recovery partition . and the code running on the cpld does not play nicely with anything but the modified xenium os1.0 that came on it originally. Which in a a panic I overwrote the flash.bin by accident. Trying to update the code on the cpld itself to openxenium so it'll hopefully work again. So to reiterate, the code running on the clone REQUIRES its own modified xenium OS for the chip to function. Official xenium OS does not work. Which is why I was asking about JTAG to flash the cpld itself. So I ask again, will that programmer I linked work for this purpose?

So, an update of sorts. Got them flashing "properly" by using a different Xbox. But they'll only hold the OS for one boot then they FRAG and I have to reflash them. And during that one boot up they work, they're sooo laggy. Its almost a half second delay between button press and something moving on screen. Beginning to think using old xenium clones was a baaaad idea.

they're the xenium blue clones. me and a few others ive encountered have discovered the blue clones will NOT hold an update(they'll take it for one or two boots then the flash gets wiped), the ice clones however will happily take an update. looks like i need to find some way to upload the openxenium code to the cpld without a jtag programmer around here, save for a nand-x with the v3 code on it.

There is many available circuits, from plain to MCU based, with 25 pin, 9pin and USB connectors with PC. The only variant I can't use is with 25pin connector. RS232 can be handled on laptop only trough FTDI based converter. On desktop there is native serial port with the proper chipset work with full voltage signals between -15V and +15V, i.e. respecting fully RS232 standard.

Grumpy_Mike:

:o

OK looks like you are right. The JTAG is on pins ADC4 to 7. You will have to connect your interface to those pins and also enable the JTAG interface you have to enable the JTAGEN Fuse bit.

I though I was clear in the first post. I do not have ages to search and read doc for all these different circuits, as well as ATMEL documentation. And more important, this is not my job, but simply hobby.

Pretty good for hobby use.

vs the other much more expensive ones.

-search/en/development-boards-kits-programmers/programmers-emulators-and-debuggers/2622818?k=jtag%20ice

I wouldn't be much interested in writing a bunch of PC code to do this, others might be.

I get by with just Serial.print statements for debugging, but I only code for embedded projects generally.

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