Phat Zephyr/Opus/Falcon/Jasper Install Guide (R-JTAG+)

R-JTAG+ install guide for phat Zephyr / Opus / Falcon / Jasper Xbox 360 consoles using the CR4 XL. You can have the absolute latest dashboard version installed if you wish.

Recommended Hardware

(This is what I use myself in my own personal installs)

• CR4 XL
• CR4 Complete Phat QSB kit — including the R-JTAG ALT QSB v2 (inc. AUD_CLAMP)
• Double Shielded Pro CPU RST cable — Phat
• JR Programmer v2 (a v1, v1.1, NAND-X, or even a DemoN also works)

The CR4 XL board comes with wires and tuning caps (10pf, 22pf, 30pf, 47pf, 68pf, 82pf, 100pf). I like the double shielded pro cables Xecuter makes because they give a perfectly grounded line for a guaranteed clean wave.

Default DIP Settings (S1)

The DIP settings above are set to the perfect CENTER (average) for these phat consoles. Try DIPs 2, 3 and 4 to get the best results for your console. My personal favourite is DIP 3 (for example, 3 and 7 ON if you have a Falcon).

Postbit Jumpers (P1)

These fine-tune the resistor on Postbit. The jumper should be set to 0 ohms by default. In a very few instances (about 5 out of 100 motherboards) a 10-ohm or 100-ohm resistor was required to shape a perfect wave.

QSB Kit Install

This is the complete QSB kit for phat installs. The CR4 XL code was designed and tuned with these installed and is highly recommended for a perfect install. They include all the necessary connectors for NAND-X, JR-Programmer, USB COMMS cable, RATER, AUD_CLAMP & R-JTAG ohms tuning.

As you can see it doesn't get much easier than this. I added a tuning cap just to show where it sits, but it didn't really need one (cut cap legs short, sitting close to the board). You can add an extra wire to K for RATER auto-reset support (KIOSK). Trim all wires to be as neat as possible — don't have them straying all over the motherboard. Extra pads: ROL is for the Ring of Light LED mod, CR_EN is for the DemoN CoolRunner enable/disable mod.

JTAG ALT V2 QSB (Back of Board)

Flip the motherboard and install the JTAG ALT V2 QSB. You don't even have to solder that tiny corner resistor anymore.

• 2-way switch: set to ON
• 3-way switch: set to the middle (lets you choose a resistor setting of 330 or 470 via the jumper)
• Jumper: set to 470 as default — you can try either, it's only for hardcore tuners
• Solder jumper: should be 1-3 for the AUD_CLAMP option
• Green wire: soldered to Q2N1

CPU_RST Point (Blue Wire)

We tested all the CPU_RST points — C7R112 consistently gave the best results with CR4, especially with the Xecuter Double Shielded Pro cable or the IPEX CPU_RST cable. The IPEX cable is especially neat and tidy.

Final placement of the CR4 XL — super tidy.

Optional: Permanent External NAND Access

If you want permanent external access to the NAND, hook up the QSB EXT V3 adapter.

Zephyr Install Example

A Zephyr install with the double shielded pro cable — here's what it looks like. You may or may not need a 22pf cap.