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Ava Chow

@achow101.com

Bitcoin Core contributor | mod @ http://bitcoin.stackexchange.com and http://bitcointalk.org | She/her πŸ³οΈβ€βš§οΈ

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Latest posts by Ava Chow @achow101.com

The clamp I got supposedly came with an adapter, but that adapter didn't actually adapt the 16 pins from the clamp to the 8 pins for the CH341A, so I ended up rewiring it manually.

26.02.2026 20:52 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

The R740 needed a SOP16 as that's the form factor of the chip. SOP8 won't fit and also the pinout is different.

www.mxic.com.tw/Lists/Datash... is the datasheet for the chip that was in my R740. I rewired the SOP16 clip according to the pinout diagrams on page 6.

26.02.2026 20:50 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

live now

bug hunting

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23.02.2026 20:41 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

> what OS are you using?

Proxmox

> what happens if you run a BIOS update from Dell? Or a firmware update?

Dunno, haven't had a chance to try.

I expect a BIOS update to overwrite the mod, but not any firmware update except maybe iDRAC.

20.02.2026 21:04 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

No, the clamp connects to the pins directly, it's just a little bit fiddly. I would read the chip 3 times and make sure all 3 reads got the exact same dump, and not disconnect or even touch the programmer until I was done writing the modified BIOS back.

20.02.2026 20:46 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

4. Boot into the OS, build the ReBarState program, and run it with a parameter of 32:, i.e. ./ReBarState 32

I didn't need to do the UEFIPatch or DSDT Patching steps.

For all of the BIOS chip reading and writing, I use the flashrom tool.

20.02.2026 20:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

2. Modify the dumped BIOS with UEFITool. The ReBar FFS goes in the volume with the last DXE module, before the volume with the first PEI module. For me, this was immediately after the module with GUID 7F7292E8-B594-45FA-92CD-78534D8B7EEC

3. Write the modified BIOS back to the chip

20.02.2026 20:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Step by step, it was:

1. Dump the BIOS with an external programmer. I used a CH341A off of Amazon with a SOP16 clamp. Normally BIOS chips are SOP8, and that's what the CH341A expects, so the clamp needs to be rewired to match the SOP8 pinout. This is possible as they only use 8 of the pins anyways.

20.02.2026 20:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

The main things were that I used an external BIOS programmer to dump the BIOS, placed the ReBar FFS module after the last DXE module, wrote the modified BIOS back to the chip, and used the ReBarState program to actually enable ReBar.

20.02.2026 20:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
[Release] Resizable BAR BIOS EFI Module hi all im trying to make a dell poweredge r730 to enable rebar support, but im not getting it to work and cant understand if it’s a 64bit problem or just something else. ive attached some picture. w...

I pretty much just followed the instructions from the ReBarUEFI repo along with some hints from the discussion starting from this post: winraid.level1techs.com/t/release-re...

20.02.2026 20:29 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

live now

finding paths

twitch.tv/achow101

16.02.2026 20:04 πŸ‘ 4 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Preview
Release 3.2.0 Β· bitcoin-core/HWI Also available on PyPi and can be installed with pip install -U hwi Added Jade Plus Support BitBox02 Nova support Testnet4 Support Jade native PSBT signing PSBT MuSig2 fields

HWI 3.2.0 is now available at github.com/bitcoin-core... or on PyPI at pypi.org/project/hwi/...

This is a minor release which brings support for the Jade Plus and BitBox02 Nova devices.

10.02.2026 04:35 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

path losing, relatively

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09.02.2026 20:09 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

more code review i guess

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02.02.2026 20:28 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

live now

core review

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26.01.2026 20:08 πŸ‘ 4 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

live now

reading and writing code

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19.01.2026 20:16 πŸ‘ 5 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

live now

i hate bdb

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12.01.2026 20:11 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

live now

not deleting wallets

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05.01.2026 21:06 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

live now

squashing bugs

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22.12.2025 20:10 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

live now

maps of as's

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08.12.2025 20:10 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

catching up on everything that's happened in the last 5 weeks

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17.11.2025 20:04 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

code review backlog

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27.10.2025 19:05 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

still scheming rpcs

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06.10.2025 19:07 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

more rpc insanity

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29.09.2025 19:04 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

rpc insanity

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22.09.2025 19:05 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
stopping-arbitrary-data-notes.md GitHub Gist: instantly share code, notes, and snippets.

Notes from the stream: gist.github.com/achow101/fd0...

15.09.2025 21:56 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

live now

thought experiment: what would it take to actually stop arbitrary data?

www.twitch.tv/achow101

15.09.2025 19:06 πŸ‘ 2 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0

live now

still prepping v30
later: encrypted dns seeder crawling

www.twitch.tv/achow101

08.09.2025 19:15 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Streaming now

miniscule outputs

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01.09.2025 19:17 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

I don't use twitter, and I have Luke and many others muted, so maybe there are earlier instances.

27.08.2025 17:09 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0