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Author Topic: Antminer S21+ with new Hashboard variant  (Read 137 times)
cygan (OP)
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October 23, 2025, 08:26:46 AM
Merited by philipma1957 (1)
 #1

since almost a month i am the proud owner of an antminer s21+ 235th/s model which is equipped with the latest A3HB70703 hashboard variant (the previous version is A3HB70701, for which support is available)
and this is now my problem, because i can't find a suitable custom firmware for this model which already supports the new hashboards... neither braiins nor vnish currently support it with the current firmware. the developers of vnish and braiins are aware of the problem and are doing everything they can to fix it with the next release

do any of you know whether there is already custom firmware from other providers that supports the new s21+ models?
are there other users here who have the same problem as me...?

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October 23, 2025, 12:50:54 PM
 #2

since almost a month i am the proud owner of an antminer s21+ 235th/s model which is equipped with the latest A3HB70703 hashboard variant (the previous version is A3HB70701, for which support is available)
and this is now my problem, because i can't find a suitable custom firmware for this model which already supports the new hashboards... neither braiins nor vnish currently support it with the current firmware. the developers of vnish and braiins are aware of the problem and are doing everything they can to fix it with the next release

do any of you know whether there is already custom firmware from other providers that supports the new s21+ models?
are there other users here who have the same problem as me...?


https://altairtech.io/product/epic-umc-universal-mining-control-board/


maybe this controller works.


they do have a lot of firmware updates

https://github.com/epicblockchain/powerplay-antminer/releases

https://epicblockchain.io/support/


you can email contact both the seller and the company that makes the controller.

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October 28, 2025, 05:27:53 AM
 #3

We Vnish do support them I just don't think it's in the public right now. We release these models to private large scale clients first and then trickle it down to public it release once others end up copying us. Sadly the competitors ruin it for the rest of us. That being said I have seen that tuning other have for the s21+ and I would not deploy them right now. It's a new chip and you don't want to ruin your miner with firmware that others test on the general public. The 1370 chip behaviors differently than previous generations I believe we finally figured out how to tame this beast properly just a few weeks ago.

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cygan (OP)
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October 28, 2025, 07:45:18 AM
 #4

i'm eagerly awaiting the new vnish version...
until then i'm using braiins, who have managed to integrate the s21+ miner with the new hashboard version into their software
so far i haven't had any problems with this braiins version either

Chris via Egnatia
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November 06, 2025, 02:55:49 PM
 #5

i'm eagerly awaiting the new vnish version...
until then i'm using braiins, who have managed to integrate the s21+ miner with the new hashboard version into their software
so far i haven't had any problems with this braiins version either

Ah, so Braiins gave you a pre-release version? How is the new miner behaving relative to previous models? There are concerns, especially since the new S19K PRO BHB56907 dropped in price all of a sudden.
cygan (OP)
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November 06, 2025, 03:29:23 PM
 #6

✂️
Ah, so Braiins gave you a pre-release version? How is the new miner behaving relative to previous models? There are concerns, especially since the new S19K PRO BHB56907 dropped in price all of a sudden.

unfortunately, i can't say how my S21+ compares to other miners, as i haven't had any comparable models in operation before
but what i can say is that i am very satisfied with the new S21+ variant. it is currently running at a power target of 2175w with 160 th/s and has an efficiency of ~13.8w/th/s Smiley

maybe i'll be lucky and get to try out the new vnish alpha version this weekend Cool

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