The firmware bootloader (like the bios of an PC.) is not flashable. It can only be reload via JTAG. Download mode is in that bootloader. That's why it always shows p6810.
Recovery partition is in mmcblk0p6, Same for all 7.7 models. Odin doesn't have assert to recognize model.
Did you flash the p6800 recovery? If you use an p6800 PIT, you should use the p6800 recovery to match the partitions.Preload for p6800 is 11 and 10 for p6810. You can always backup the whole partiton with dd cmd. dd if=/dev/block/mmcblk0p11 of=<a file>. but it would be the whole partition size.
Don't know why my 184.108.40.206 can't boot on your tab. if your PIT is from stock roms, it should work. The only thing I think of may be recovery partition is resized.
There are data in /efs which is unique to p6800 and p6810 but only encrypted partition affected.
Try unpacking the initramfs of the recovery.img to study the mount points. The img is similar to a zImage or boot.img. It is probably the fstab not match.
I thought a successful Odin flash would indicate the recovery parttion size size is ok (with other recoveries being able to load)? I might unpack the recovery just to see as you suggest, but I was really hoping for "flash and play" simplicity for users using the guide.
Users going to the trouble of using the guide probably don't want to backup/restore manually (PITA), custom recovery is the way to (if possible).
A little bewildering since my tab is effectively now a P6800 with same partitions.
Appreciate your time taken and input mate.
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