Being familiar with the process for a version 1.6 XBOX.... All one would need in that case would be a Slayers v. 2.7 boot disc (and if they're wanting to set up a large hard drive, a boot disc containing XBPartitioner 1.3).
For the BIOS end of things, a version 1.6. XBOX user would choose a BIOS that was compatible with an XBOX 1.6. In your case, you'd want to avoid the 1.6-specific BIOS files (as others have mentioned). The Hexen disc is an alternate to Slayers. However I don't like how the Hexen utility starts writing Dashboard files to the drive as soon as you go to flash the BIOS.
So, back to the version 1.6 XBOX example. If partitions C and E are working already and the goal was to just wanted add LBA48 support for large drives and re-do F: and G: partitions, one could:
- Power off unit
- Set Bank to 2
- Set Xecuter 2.6 bank protection switch to off
- Make sure chip enable switch is on
- Insert Slayers 2.7 disc
- power system on
- select "EEPROM / FLASH MOD CHIP or XBOX TSOP"
- select "FLASH MOD CHIP of XBOX ON-BOARD TSOP"
- choose appropriate BIOS file. For a version 1.6 XBOX with an Xecuter 2.6ce, the option to "Flash MOD ONLY ON v1.6 w/EvoX M8 v16 *FC* F:&G:" seems to work well (in your case you do NOT want to use that particular BIOS file. You'd use one for machines 1.5 and earlier).
Once done, the machine powers off on itself off.
Then the chip protection can be switched on again.
From there on, it's up to you how you take care of partitioning and formatting.
Since the goal of the example I gave was to modify the partitions on a 500 GB drive that was already kind of working, the XBOX would just be allowed to boot into the existing dash (Avalaunch for example). Then a disc containing XBPartitioner 1.3 would be inserted, and partitions F: and G: could be re-partitioned and formatted (e.g. 16k clusters with F and G receiving about 235 GB of space each). The BIOS that I listed for this example does indeed have LBA48 support included so XBPartitioner shouldn't show a warning message about it not being able to find LBA48 info.
In your case, you'd likely just boot back into Slayers again and choose "NEW INSTALL / FULL REBUILD".
After that, you can select the "CHANGE STARTUP DASHBOARD" option if you want to use a different style of interface. Avalaunch is pretty cool, IMHO though.
As you can see, it's possible to get LBA48 working without bothering with EVTool and X2BM and customizing a BIOS.
Note: There's a chance that you might lose video output if you flash using a particular BIOS files. For that reason, be sure to mark down the exact steps you took to flash the BIOS using the Slayer's disc, just in case you need to re-flash the BIOS blindly. Make a note of a few other BIOS files on the list that might be compatible with your system so that they can serve as alternate BIOS files if the initial one doesn't work out.
Additionally, you can use utilities like Extract-XISO and Nero on a PC to turn folders full of files into discs useable on the XBOX. That's one way to get XBPartitioner 1.3 running on a machine with an unformatted hard drive.