Hacking Xbox Jasper RGH1

MrDriver · Jun 6, 2020

I have a Jasper motherboard , which can be used with RGH1.

I have a matrix chip without the oscillator. It has been flashed with the generic RGH1 timing file on Jrunner. I belive this timing is normally intended for the cool runner.

However, on the matrix chip, it takes numerous cycles for it too boot.

It’s been a while, but I can recall the RGH1 being instant boot.

Could someone advice if the process is any different with the matrix for RGH1 ?

brickmii82 · Jun 7, 2020

MrDriver said:
I have a Jasper motherboard , which can be used with RGH1.

I have a matrix chip without the oscillator. It has been flashed with the generic RGH1 timing file on Jrunner. I belive this timing is normally intended for the cool runner.

However, on the matrix chip, it takes numerous cycles for it too boot.

It’s been a while, but I can recall the RGH1 being instant boot.

Could someone advice if the process is any different with the matrix for RGH1 ?

Iirc you might need a 68nF cap in line on PLL Bypass. I can’t remember which that is on matrix atm.

MrDriver · Jun 7, 2020

I Don’t have a 68nf cap readily available. I don’t have any experience with the RGH 1.2 method and would ask if this method is just as good as the RGH1 method?

mad from my understanding this would not require any cap etc

brickmii82 · Jun 7, 2020

MrDriver said:
I Don’t have a 68nf cap readily available. I don’t have any experience with the RGH 1.2 method and would ask if this method is just as good as the RGH1 method?

mad from my understanding this would not require any cap etc

Yeah it’s almost the same. Both use PLL to slow the cpu down. RGH1.2 just uses rgh 2.0 ECC and Xebuild. I think it works on RGH 1.0 dashboards also, so you may not have to update.

MrDriver · Jun 12, 2020

I have updated the console dashboard to the latest in preparation for the RGH 1.2 .

i dumped the nand and I ticked Glitch 2 image for the ECC and i adjusted the post pll wire, according to the RGH 1.2 diagram.

However, the matrix chip blinks and attempts to glitch but the console does not boot.

any advice for troubleshooting?

DinohScene · Jun 13, 2020

Shorten the CPU-RST wire bit by bit?
RGH is tricky to get right.

MrDriver · Jun 13, 2020

thanks i will tinker with the wiring. I was hoping that it would work first attempt, haha wanted to avoid having to adjust the wiring etc.

brickmii82 · Jun 16, 2020

MrDriver said:
thanks i will tinker with the wiring. I was hoping that it would work first attempt, haha wanted to avoid having to adjust the wiring etc.

Which timing file did you flash? You can try others, though typically it boots with 19-21. Also, did you tick the CR4 box? Sometimes that helps also. Also , post your install pics so we can see.

SundayWarrior · Jun 16, 2020

Just buy normal chip (ace v3) with oscilator and install it with s-rgh.
And - best placig chip on fat on photo. Matrix good chip, but for beginer need more work

Hacking Xbox Jasper RGH1

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