[Q] Can S-OFF be done through recovery or fastboot?? USB not working... topic

I would like to update the firmware on my phone as I believe it is preventing my USB port to work and/or charge while it is powered on. I also believe the only way to change the firmware is to have S-OFF so how can I do that if my USB port doesn't work while in the OS. The USB works perfect in fastboot or custum recovery mode. 2.8.3.0 twrp. Can anyone help?? I thought I could flash firmware 6.09.401.12. My phone specs are listed below
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.57.0000
(bootloader) version-baseband: 4T.27.3218.14
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 5.11.661.8
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid: 00000000000000
(bootloader) product: m7_ul
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0712000
(bootloader) cidnum: TELUS001
(bootloader) battery-status: good
(bootloader) battery-voltage: 4104mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-e47fb74b
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!

Thanks for any help on this.