Yes, that's the number. I'm going to assume you mean 2.15.00.09.01. The latest radio is 2.15.00.11.19. Since you have hboot 2.02, and never flashed the latest, you must still have the former. Please verify, first.
So, here's what you'll want to do:
1) Copy the zip for fresh 3.5 and the zip for the combo radio update to the root of your sdcard.
2) Boot into recovery if you aren't already there
3) Wipe data/cache/dalvik
4) Flash the ROM; do not reboot
5) Flash the radio update. It will prompt you to reboot (through recovery option). When you do, the phone will turn back on, and go to a black screen with a green arrow. Don't touch anything. Just let it sit until it reboots itself back into recovery.
6) Once you're back in recovery, reboot, and you should be good to go.