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stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 2807

Posted: 10:40pm 03 Mar 2026

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I googled rpi config.txt read only and no one has made it writable it seems, very odd. same with getting admin to change the file attributes.
thing is I had this running at 2200MHz by adding
over_voltage=8
arm_freq=2200
force_turbo=1
so I must have edited config.txt at some time.??

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6506

Posted: 11:40pm 03 Mar 2026

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Quote stan,
at a command prompt
sudo nano /boot/firmware/config.txt

I was able to edit and save the file without any issues

Did you try?

VK7JH
MMedit

stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 2807

Posted: 02:07am 04 Mar 2026

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TassyJim said

Quote stan,
at a command prompt
sudo nano /boot/firmware/config.txt

I was able to edit and save the file without any issues

Did you try?

Dunno what happened but that worked
edited and saved...scratch head as tried before it was read only??
over_voltage=8
arm_freq=2200
force_turbo=1

vcgencmd measure_clock arm says 2200 so happy days :) but weird

stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 2807

Posted: 08:35pm 04 Mar 2026

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dddns said

stanleyella said I haven't got admin access yet on rpi. seems a secret and why is config.txt now read only... stop people overclocking?

I almost can't believe that overclocking is configured in this text file. I'm interested, please post the content

In Trixie OS find arm_boost=1 and comment out then add 3 lines
# Run as fast as firmware / board allows
#arm_boost=1
over_voltage=8
arm_freq=2200
force_turbo=1

dddns
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Joined: 20/09/2024
Location: Germany
Posts: 819

Posted: 09:10pm 04 Mar 2026

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Thanks Stan, I'm looking forward to buy one. You really triggered me :)

stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 2807

Posted: 10:19pm 04 Mar 2026

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@dddns- I do not know if you use mmedit to write code and load to pico but if you get a rpi 400 and install mmedit you will need this line in terminal
sudo usermod -aG dialout $(rpi user name)
This will make it connect usb to pico.
I just installed Trixie on another ssd and set it as before and it is working fine at 2200 overclock. youtube playback good.

JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 4299

Posted: 10:23pm 04 Mar 2026

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stanleyella said I haven't got admin access yet on rpi. seems a secret

You can do anything (including overwriting the whole system!) using sudo

If you want to do several things as root you can typically use
sudo bash

and you have a root shell. You can get out of it using
exit
(or end of file, usually Ctrl-D)

But remember it is easy to ruin your system!!
(which is why they've made root a bit harder to use)

John
Edited 2026-03-05 08:24 by JohnS

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