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jardag@precise-GiB:~$ lsusb
Bus 001 Device 006: ID 15ba:002a Olimex Ltd. ARM-USB-TINY-H JTAG interface
jardag@precise-GiB:~$ cd /dev/bus/usb
crw-rw-r-- 1 root root 189, 0 Apr  4 21:13 001
crw-rw-r-- 1 root root 189, 5 Apr  4 21:13 006

jardag@precise-GiB:/dev/bus/usb/001$ cat /etc/udev/rules.d/40*
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0x15ba", ATTRS{idProduct}=="0x002a", MODE="0660", GROUP="lp"

Why the mode and group of the 006 did not change ?

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It is possible that your rule is overridden by a late rule.

~$ /lib/udev/rules.d/40-flashrom.rules

ATTRS{idVendor}=="15ba", ATTRS{idProduct}=="002a", MODE="664", GROUP="plugdev"

Try rename your rule to start with number higher then 90-*

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