lot's of problems
You have to get an RUU according to your CID.Get into your bootloader (by pressing power + vol-) and when you see fastboot usb give the command fastboot getvar all.Then copy-paste everything here except your imei and serialno so we will be able to help you further. If you cannot find an RUU for your CID you have to S-OFF your device so you be able to change your cid. After that you can flash any RUU.
You probably have bootloop issues with custom roms because you are S-ON user and you have to flash mannually the kernel.Just extract the boot.img from the rom zip you flash from your recovery in the folder you have fastboot and then flash it from your bootloader by using the command fastboot flash boot boot.img.Then your custom Rom should be working. After that you can S-OFF your bootloader with runrummer or with juopunutbear as long as you have already unlocked your phone with HTC_dev.
** Also after S-OFF it would be nice to upgrade your radio to the latest. **
Hi Gatosbil, info below many thanks for you help
rm-tools>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.27.0000
(bootloader) version-baseband: 11.23.3504.07_M2
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.32.161.11
(bootloader) serialno: ****************
(bootloader) imei: ****************
(bootloader) product: pyramid
(bootloader) platform: HBOOT-8260
(bootloader) modelid: PG5813000
(bootloader) cidnum: VODAP001
(bootloader) battery-status: good
(bootloader) battery-voltage: 3929mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 617f0a98
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.568s