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1. Yes - pretty confident that went okay, especially cause it works with the tbtOnPch SSDT. 2. Even pre-connected devices. It has always been pretty funny, hence why I was exploring the options here. Usually, if I disconnect AC from the comp, it takes sometimes MANY cold boots and reboots to get...

It used to work without an SSDT, but now it isn't working with or without. The only way it seems to work right now is with the tbtonpch ssdt + acpi tweaks. Have tried cold boot several times, and yeah both bios settings are as you say. Weird!

Thanks so much Casey. I enjoyed experimenting with flashing the chip too. I have to admit i can't seem to get it working without the thunderbolt bus SSDT at all now though

What are you referring to when you say 'standard hot plug ssdt'? I've only tried the tbtOnPch one with limited success. I can't quite judge the tone of this post, but if it's less humour and more annoyance - I'm sorry for wasting your time man!

Hey Casey, Thanks again for all your work here. Sadly, I got nowhere with MOD3 or MOD4 either. Thunderbolt simply didn't show at all. I've reflashed the original firmware and am back to the SSDT method, though to be honest - while it is nice having Thunderbolt bus. I think I am going to return...

You are amazing, thank you. Unfortunately, it is not good news. I've tried flashing both files, MOD1 and MOD2. In both instances my Thunderbolt doesn't work at all, no matter how many warm boots I do. I've checked IOREG, and it has just disappeared completely, nothing under RP05 anymore. To...

Not at all, thank you for your contribution! In my case, with my original file - I only read it once. So to your last point 'As long as you reproduce the checksum with three reads, you SHOULD be good to proceed.' My understanding is that I did not meet that criteria with my original file...

Hey Casey, I'm really, really sorry but I think there was maybe corruption on reading the original .bin file I sent you from flash. I've just come to the computer to flash the new file today, but was looking through the documentation you posted about doing this and noticed the part about...

You are absolutely incredible, thank you so much. I will do exactly as instructed when I'm back in the studio on Monday. Regarding the SSDT, I've been using this one you posted (attached). Not sure it's necessarily the best for my system but it's the one you posted for my board and it gave me...

Sorry, i was trying to link it from dropbox. Here!

Hey @CaseySJ I am trying to share my firmware file, but my posts just keep disappearing. Not sure why or what to do?

Interesting! So - logging in is important? I usually just click restart at the login screen. Do you know if there is a patched thunderbolt firmware file avail for my mobo? I'd so love to get it to native standard.

Hey Casey, Thanks for the quick response there. I'm afraid it seems like I spoke too soon. The reality is that since following the steps in the guide, sometimes I boot that machine and have full thunderbolt with Bus and local node, sometimes it loads only in PCI, and sometimes thunderbolt...

@CaseySJ I just wanted to drop a message here to say thank you - so, so very much. This thread is an actual goldmine. I just discovered it on my renewed search to improve the thunderbolt on my GA-z170x-UD5 TH. Little did I know you'd put together a guide in these pages for that very board and I...