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Hi all,
I have been using a Raspberry Pi with OpenPlotter 3 for a few years. At the beginning of my new sailing season (a few days ago) I did an update. Unfortunately, that broke SignalK and also a few other things. I thought ths would be a good occasion to start anew and switch to OpenPlotter 4, so I flashed the OP4 image to an SD card. Then I updated with sudo apt update, sudo apt upgrade.
After this, the new card wouldn't boot anymore with the green LED flashing 7 times (kernel.img not found). I repeated the whole process. but with the same outcome. i don't see anything strange in config.txt, also I don't see missing files in /boot/firmware (but I'm not an expert).
Can anyone point me in the right direction? I have no working image now, which is not ideal.
Thanks in advance.
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sounds odd. i flashed a card a few weeks ago & all was well.
What Pi & what size sd card are you using?
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(2026-05-05, 09:34 AM)PaddyB Wrote: sounds odd. i flashed a card a few weeks ago & all was well.
What Pi & what size sd card are you using?
It's a Pi 4 with a 64Gb SD Card.
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(2026-05-05, 09:57 AM)Kukel Wrote: (2026-05-05, 09:34 AM)PaddyB Wrote: sounds odd. i flashed a card a few weeks ago & all was well.
What Pi & what size sd card are you using?
It's a Pi 4 with a 64Gb SD Card.
bit busy but I'll try again here & see what happens later.
Did you het the image from in here? I usually use the headless.
https://openplotter.readthedocs.io/4.x.x...ading.html
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(2026-05-05, 10:53 AM)PaddyB Wrote: (2026-05-05, 09:57 AM)Kukel Wrote: (2026-05-05, 09:34 AM)PaddyB Wrote: sounds odd. i flashed a card a few weeks ago & all was well.
What Pi & what size sd card are you using?
It's a Pi 4 with a 64Gb SD Card.
bit busy but I'll try again here & see what happens later.
Did you het the image from in here? I usually use the headless.
https://openplotter.readthedocs.io/4.x.x...ading.html
Yes I downloaded from there. I used the headless image as well.
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(2026-05-05, 07:52 AM)Kukel Wrote: Hi all,
I have been using a Raspberry Pi with OpenPlotter 3 for a few years. At the beginning of my new sailing season (a few days ago) I did an update. Unfortunately, that broke SignalK and also a few other things. I thought ths would be a good occasion to start anew and switch to OpenPlotter 4, so I flashed the OP4 image to an SD card. Then I updated with sudo apt update, sudo apt upgrade.
After this, the new card wouldn't boot anymore with the green LED flashing 7 times (kernel.img not found). I repeated the whole process. but with the same outcome. i don't see anything strange in config.txt, also I don't see missing files in /boot/firmware (but I'm not an expert).
Can anyone point me in the right direction? I have no working image now, which is not ideal.
Thanks in advance.
OK, I solved it, it was an error I made when writing the image that caused this.
I now have OpenPlotter4 up and running on my home RPi4 and installed everything I need. My idea is to prepare everything at home and when it works as it should I backup the SD card and take it to the boat to use it in the RPi4 that I have there.
There is still one thing that I can't get to work however. When I want to use the RPi headless, with a VNC connection, it works for only 30 seconds or so, and then the connection stops working. The client still shows as connected to the RPI's wifi hotspot, but no data is transferred. It is not a VNC problem, because other apps also don't get data via the wifi connection (AvNav, internet browser).
I tried 5G only hotspot, no difference. Different clients, all same result.
The RPi works fine as wifi client connecting to my home network. With another OS on another SD card it also works fine as a hotspot with VNC.
The SD card I use now is a brand new Raspberry SD card.
Any thoughts?
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(2026-05-21, 07:09 PM)Kukel Wrote: There is still one thing that I can't get to work however. When I want to use the RPi headless, with a VNC connection, it works for only 30 seconds or so, and then the connection stops working. The client still shows as connected to the RPI's wifi hotspot, but no data is transferred. It is not a VNC problem, because other apps also don't get data via the wifi connection (AvNav, internet browser).
I tried 5G only hotspot, no difference. Different clients, all same result.
The RPi works fine as wifi client connecting to my home network. With another OS on another SD card it also works fine as a hotspot with VNC.
The SD card I use now is a brand new Raspberry SD card.
Any thoughts?
Is that on a tablet? I have similar on a cheap tablet, gives up quite quick but the laptop seems fine.
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(2026-05-21, 07:31 PM)PaddyB Wrote: (2026-05-21, 07:09 PM)Kukel Wrote: There is still one thing that I can't get to work however. When I want to use the RPi headless, with a VNC connection, it works for only 30 seconds or so, and then the connection stops working. The client still shows as connected to the RPI's wifi hotspot, but no data is transferred. It is not a VNC problem, because other apps also don't get data via the wifi connection (AvNav, internet browser).
I tried 5G only hotspot, no difference. Different clients, all same result.
The RPi works fine as wifi client connecting to my home network. With another OS on another SD card it also works fine as a hotspot with VNC.
The SD card I use now is a brand new Raspberry SD card.
Any thoughts?
Is that on a tablet? I have similar on a cheap tablet, gives up quite quick but the laptop seems fine.
No, it's when using multiple devices (quite new phones and tablets).
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