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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