Free Flash Drivers

Hello everyone .
i have HTC sprint firmware & i want to flash UL firmware & receive OTA
i came by many FAQs , Posts & threads & ended up with even more confusion than ive already had

Phone details :
locked bootloader with stock recovery
S-off
Rooted
Stock firmware

C:Android>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.57.0000
(bootloader) version-baseband: 1.02.20.0922
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 5.03.651.3
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid:
(bootloader) product: m7_wls
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0720000
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 4020mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-1f512bb6
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.188s

-Do i have to change the MID to PN0710000 using commands in THIS THREAD and run UL RUU directly or what !!

as mentioned :
and is it significant to follow upgrade sequence (e.g from 5 to 7 ) do i need to flash 6 or not ? im on 5.03.651.3
someone said you have to flash update xx.xxx.1 then xx.xxx.2 before upgrading to 7.xxx.xx :confused:

what is the correct steps to upgrade & to change to UL ?