It turns out you must manually select the I2C bus number (I also enabled I2C on raspi-config). Since I'm using CAM0 on RPI5, the bus is 6. Example:
./mv_mipi_i2c.sh -r -f manufacturer -b 6
This works.

Yes

I think something is still missing, because I still can't run ./mv_mipi_i2c.sh successfully.

For example,

./mv_mipi_i2c.sh -r -f manufacturer

returns

Manufacturer 0 not recognized

./mv_mipi_i2c.sh -r -f model

returns

model 0 not recognized

EDIT

It turns out you must manually select the I2C bus number (I also enabled I2C on raspi-config). Since I'm using CAM0 on RPI5, the bus is 6. Example:

./mv_mipi_i2c.sh -r -f manufacturer -b 6

This works.

Thank you for your reply.

I'm using the files here:

https://github.com/veyeimaging/mvcam_raspberrypi/tree/392451009cc93cfd56bd3c0096c329e7a429f6f8/mv_tools_rpi

and, according to the docs, before running mv_mipi_i2c.sh I must run

./enable_i2c_vc.sh
./camera_i2c_config

but ./camera_i2c_config is failing with:

setting GPIO for board revsion: d04170
Failed: don't know how to set GPIO for this board! Type is 17
Use i2c-10 for the sensor (-y 10)

(I'm running a Raspberry Pi 5.)

I also tried the files here: https://github.com/veyeimaging/raspberrypi_v4l2/tree/c782fc464d76c5ed2a7f8f31df72eaaa51e0dceb/mv_tools_rpi
but same error.