M7 Trying to get back to stock-but need a helping hand

hey guys, i am now about to sell my m7 after over 2 years :)

a long time ago when i unlocked the boot loader, and installed tmrp i made a backup of my stock ROM. its been on a usb pen along time now. so today i used twrp to restore it. all when well :) i then decided to relock the bootloader using fastboot. in my ignorance i thought this was all i would need to do. upon reboot a rom update was found 6.09.401.10. i am currently 6.09.401.5. downloaded and restarted to install the update. recovery wouldnt load. okay that from the twrp flash replacing it. so of course onto xda to find a stock recovery. i believe i found it. but now i am worried- do i need to re unlock the bootloader? will i need to get the token again? or do i need the rru.exe 6.09.401.10? what is the best way to do this as unsure what to do next? as it will need ota updates. i have added my version info below just encase its needed.

(bootloader) version: 0.5
(bootloader) version-bootloader: 1.57.0000
(bootloader) version-baseband: 4T.29.3218.08
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.09.401.5
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: HT37WW905236
(bootloader) imei:
(bootloader) meid: 00000000000000
(bootloader) product: m7_ul
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0710000
(bootloader) cidnum: HTC__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 4197mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-6d8a0b9b
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0

thanks in advance :)