The latest conbee II firmware available from the firmware page is 0x26700700 and according to the release notes it was supposed to ship with deconz 2.11.5 stable. However, this version of the firmware is not included in the latest 2.13.4 stable deconz .deb files, they include the older 0x26660700 conbee II version instead.
This is the case for both Ubuntu and Rasbpian .deb files available for download at the deconz site for version 2.13.4. Both debs include the older deCONZ_ConBeeII_0x26660700.bin.GCF in /usr/share/deCONZ/firmware. Take a look for example at http://deconz.dresden-elektronik.de/raspbian/stable/deconz-2.13.04-qt5.deb.
Shouldn’t the .deb include the latest firmware?