I tried Reboot to CoreElec (latest version). As dtb.img, I tried: s4_s905y4_2g, s4_s905y4_4g, s4_s905y4_buzztv_hd5, s4_s905y4_khadas_vim1s. I tried corelec alpha 3, stable version, etc…
ADB command reboot update? yes through wi-fi, same issue "
yes, I also tried ADB through wifi, same results: Android Recovery page