Fail to reboot/poweroff Openwrt 19.07.06 X86 64

Installing and Using OpenWrt
1

I installed a 64 bit Openwrt 19.07.06 X86 on ITX motherboard Intel J1900 cpu , with USB stick. When I reboot (or poweroff) it from LUCI or LEDE just stuck on sda .......synchronizing SCSI cache. Similar issue with :
Reboot problem OpenWrt 18.01 x86_64, which solved with changed the BIOS setting os from win7 to win8. However I can't try because no setting about OS on my motherboard's BIOS. But I have no problem with Generic X86 Openwrt 19.07.06
Please advise how to fix it

2

create script file

reboot.sh:
#!/bin/sh
echo 1 > /proc/sys/kernel/sysrq
echo u > /proc/sysrq-trigger
sync
echo b > /proc/sysrq-trigger

poweroff.sh:
#!/bin/sh
echo 1 > /proc/sys/kernel/sysrq
echo u > /proc/sysrq-trigger
sync
echo o > /proc/sysrq-trigger