Thanks for your reply On my jolla 1: I've flashed btrfs image and wifi works fine. I've flashed ext4 image and wifi works fine. I've flashed again lvm image and wifi doesn't work.
In SailfishOS-sbj-lvm-3.2.0.12-sbj-1.0.2.7 folder: fastboot flash boot boot.img fastboot flash aboot emmc_appsboot.mbn fastboot flash recovery recovery.img fastboot flash sailfish sailfish.img001 fastboot flash rpm rpm.mbn fastboot flash sbl1 sbl1.mbn fastboot flash sbl2 sbl2.mbn fastboot flash sbl3 sbl3.mbn fastboot flash tz tz.mbn