Its out >> This was actually released last week already, but with all the BAN news we kinda missed it (but we're still the first site to report about it ;)) ... so here it is :)
Free60 JTAG/SMC XeLL Hack for Jasper-256/512mb Motherboards
After the release of the hack for Xenon, Falcon/Opus, Zephyr and Jasper-16mb motherboards, here's the Free60 JTAG/SMC XeLL Hack for Jasper (v4) motherboards with 256 and 512mb NAND chips.
This NAND image will boot your Xbox360 right into XeLL, which allows you to launch linux distros or run libxenon homebrew software, as long as you never upgraded it via the normal MS upgrade procedures to kernel 849x or higher.
From the readme/nfo:
Someone also sent us this nice diagram made by Sandungas about how to wire the JTAG hack and SPI (for NAND reading/writing via LTP with nandpro) on Falcon/Zephyr/Jasper motherboards.
Finally the Jasper JTAG Hack is here :)
This is XELL (Redline99's XeLL) inserted into 6723 Jasper-Kernel.
Don't wonder about the Filesize, its correct like that. It just flashes the beginning of the NAND so your console specific data like MAC adress will stay.
Of course you should have a working backup of your NAND before you proceed.
*** NOTE ***
It's for the Large Block Jaspers, 256MB and 512MB ;)
*Update* Latest version of the diagram made by Sandungas on the free60 wiki.