no , once you have updated ota you cannot enter fastboot/fastbootd/adnl mode . there is no way to downgrade unless using emmc programmer tool
i made custom android tv fw version for G1 based on latest ota , has features like .
- Unlock developer options
- default will Boot coreelec in SDcard and USB
- DV / HDR adaptive
- block update ota
- Remove bloatware
- work all google services , netfix …
To flash this firmware, you must not update ota.
If anyone is interested can PM me , sorry i don’t post it here because SDMC can see it and fix it
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Can the TTL tool flash the bootloader?
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no you need to remove emmc and then flash emmc dump using UFI box or easy jtag …
Tnx, I hope this will fix this very good performing and very affordable box once for all; looking forward to it.
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Thanks! i want try it
but I don’t know how to send you a private message
Click on his name “hungphutho” on the original message, and you should get two options “Message” and number of posts in this topic. Select “Message” with an envelop icon, and write message and press Send. It will be stored in your “Sent” folder in your personal message compartment. The answer will come to your “Inbox” there…
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unfortunately I do not get the envelope icon too… no idea how to PM. 
In- and outbox is missing too in my own area. I am a “basic user” only.
I’ve been here for a couple of years and don’t see a way to PM either.
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i think my account limited & can’t See option for “Message”
Then navigate to Profile → Preferences → Messages. On the right side on top row you have the “Envelop icon - Message” box for starting new PM.
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I think members should have enough posts to be able to start sending DMs.
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i think that true
@Sholander have 2.0k posts created from 2018
i have only 208 post from 2018
LOL! 
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@hungphutho
Any ideas how you could share this ROM with us? Unluckily we cannot PM you here
My G1 is even stuck on the boot logo after I emergency unplugged it on the update donwload screen… (it boots coreelec, bootloader must be unlocked).
Edit: but you could PM me it looks like.
Check PM 
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i cant message you either let @Sholander send you my tutorial video and rom
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I sent it to all that sent me the request for it.
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