The Pi 3 is a 32 bits cpu, the Pi 4 a 64 bits one.  So keep your 32 card 
for the pI 3  and install a freh, complete new OS on the Pi 4, including 
python3 and all you need for weewx, without tuchung weewx. Then when your 
Pi 4 is rolling,  you can probably copy the full weewx from the 32 card at 
their expected place, or, reinstall weewx from fresh, and copy just all 
configuration files (weewx.conf and all skins conf).
If you have done a lot of "local" modifications on the Pi 3, the full copy 
of the Pi 3 files is the simplest. 
If you had no modifications, the I would prefer to install all from scratch.
Good luck,     Paul;

Le Monday, October 10, 2022 à 9:41:12 AM UTC+2, blaise....@gmail.com a 
écrit :

> Thank you, I will do like that
>
>
> Le 09-10-22 à 23:55, Rainer Lang a écrit :
>
> I would use the following approach:
> 1. take a (new) SD card and put a bootable OS image for a RPi3 on it
> 2. try to start up /boot your RPi3 
> 3. if it doesn't boot, look up via Google the topic: creating an OS image 
> for RPi3 and get your RPi3 up and running
> 4. Once your RPi3 boots and runs, do a new weewx install
> 5. once weewx runs with the Simulator driver - shut weewx down, copy your 
> old weewx.conf, your skin files and the old weewx.database
> over to the RPi3 and restart weewx. It should then run.
>
> On 09.10.2022 22:46, vince wrote:
>
> This isn't a 'pi' forum.  You might have better luck on reddit in 
> /r/raspberrypi for general pi questions.
>
> On Sunday, October 9, 2022 at 11:36:07 AM UTC-7 blaise....@gmail.com 
> wrote:
>
>> Yes, I was not explicit enough, sorry.
>> The pi3 did not boot.
>> Le 09-10-22 à 20:31, vince a écrit :
>>
>> Which "it" did not work ?   Did the pi3 boot ?  Did weewx not work after 
>> it booted ?  
>>
>> We can't help without more information and also seeing some logs (if it 
>> is weewx you are asking about).
>>
>> See https://github.com/weewx/weewx/wiki/faq-how-to-report-a-problem
>>
>>
>> On Sunday, October 9, 2022 at 2:53:55 AM UTC-7 blaise....@gmail.com 
>> wrote:
>>
>>> Hello,
>>>
>>> I would like to migrate weewx from a Pi4 to a Pi3. I tried to simply put 
>>> the SD card and it did not, of course, work.
>>> Not being an expert Linux, can you tell me a procedure?
>>> weewx 4.8.0 and MySQL
>>>
>>> Thanks in advance !
>>>
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