[Solved] [Q] Another revert to stock story - need advice

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Hello,
I'm trying to revert my phone to the original state. I's been S-OFFed by revolutionary method, so I flashed eng HBOOT as it was suggested in another threads. Then I tried to flash original rom from RUU. At the beginning it gave me the error 155, so I tried flashing directly from fastboot and everything seemed OK until the end, where it wrote a message about some signature failure.
Here is a part of the flashing log:

</DEBUG></T185928>
</DEBUG></T185930>
<T185930><DEBUG><CMD>fastboot -s HTxxxxxxxx getvar boot-mode</CMD>
</DEBUG></T185930>
<T185931><DEBUG><OUT>boot-mode: RUU (Hboot&amp;Radio PreUpdate)</OUT>
</DEBUG></T185931>
<T185931><DEBUG><CMD>fastboot -s HTxxxxxxxx flash zip C:\Users\username\AppData\Local\Temp\{8A84FC36-535E-409A-94A3-231D50E85D54}\{50F2F878-636A-496F-A7CB-544C067E0C4B}\rom.zip</CMD>
</DEBUG></T185931>
<T190013><DEBUG><OUT>sending 'zip' (253505 KB)... OKAY</OUT>
</DEBUG></T190013>
<T190013><DEBUG><OUT>writing 'zip'... INFOadopting the signature contained in this image...</OUT>
</DEBUG></T190013>
<T190013><DEBUG><OUT>INFOsignature checking...</OUT>
</DEBUG></T190013>
<T190050><DEBUG><OUT>INFOzip header checking...</OUT>
</DEBUG></T190050>
<T190050><DEBUG><OUT>INFOzip info parsing...</OUT>
</DEBUG></T190050>
<T190050><DEBUG><OUT>INFOchecking model ID...</OUT>
</DEBUG></T190050>
<T190050><DEBUG><OUT>INFOchecking custom ID...</OUT>
</DEBUG></T190050>
<T190050><DEBUG><OUT>INFOchecking main version...</OUT>
</DEBUG></T190050>
<T190050><DEBUG><OUT>FAILED (remote: 43 main version check fail)</OUT>
</DEBUG></T190050>
<T190103><DEBUG><CMD>adb devices</CMD>
</DEBUG></T190103>
<T190104><DEBUG><OUT>List of devices attached 
</OUT>
</DEBUG></T190104>
<T190104><DEBUG><CMD>fastboot devices</CMD>
</DEBUG></T190104>
<T190105><DEBUG><OUT>HTxxxxxxxxfastboot</OUT>
</DEBUG></T190105>
<T190105><DEBUG><CMD>adb devices</CMD>
</DEBUG></T190105>
<T190106><DEBUG><OUT>List of devices attached 
</OUT>
</DEBUG></T190106>
<T190106><DEBUG><CMD>fastboot devices</CMD>
</DEBUG></T190106>
<T190108><DEBUG><OUT>HTxxxxxxxx fastboot</OUT>
</DEBUG></T190108>
<T190108><DEBUG><CMD>fastboot -s HTxxxxxxxx getvar boot-mode</CMD>
</DEBUG></T190108>
<T190109><DEBUG><OUT>boot-mode: RUU (Hboot&amp;Radio PreUpdate)</OUT>
</DEBUG></T190109>
<T190109><DEBUG><CMD>fastboot -s HTxxxxxxxx reboot</CMD>
</DEBUG></T190109>
<T190110><DEBUG><OUT>rebooting... </OUT>
</DEBUG></T190110>
<T190110><DEBUG><CMD>adb kill-server</CMD>
</DEBUG></T190110>
<T190111><DEBUG><OUT />

Now I've an original rom but it is unable to install OTA update as it ends in fastboot and **security warning**. I also noticed that I have superuser still available in the rom.
Here is an ouput from fastboot getvar all

(bootloader) version: 0.5
(bootloader) version-bootloader: 0.98.0000
(bootloader) version-baseband: 38.03.02.11_M
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 11.10.401.4


(bootloader) product: saga
(bootloader) platform: HBOOT-7230
(bootloader) modelid: PG8810000
(bootloader) cidnum: HTC__032
(bootloader) battery-status: good
(bootloader) battery-voltage: 4185mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 361a7ba6
(bootloader) hbootpreupdate: 12
(bootloader) gencheckpt: 0
all: Done!

I would like to hear some advice, what should I do next to fully revert to stock ROM, unroot and be able to use official updates. Thanks.

You should have flashed MISC partition hack from "downgrade HBOOT" thread before running the RUU.
Your problem is this:

<T190050><DEBUG><OUT>FAILED (remote: 43 main version check fail)</OUT>

RUU didn't like your main version.

So,
should I change the main version using the misc_version utility and then rerun RUU flashing process. If so, what kind of version should I choose or it doesn't matter. Right now i'm using the old ROM 1.28.401.1
I don't want to screw things up, that's why I'm asking.

The misc_version script flashes 1.00.000.0 by default, AFAIK. It's fine. Anything below the version you intend to use is fine.

Thanks a lot for the clarification. After changing the main version, RUU flashing went smoothly and all OTA updates installed without problem.