I don’t see problem on WP76 FW R13.
You can use my hello6.tar.gz.
hello6.tar.gz (314.7 KB)
root@swi-mdm9x28-wp:~# chmod 777 /tmp/test.sh
root@swi-mdm9x28-wp:~# /tmp/test.sh
root@swi-mdm9x28-wp:~# ls /tmp/123.txt
/tmp/123.txt
root@swi-mdm9x28-wp:~# cat /tmp/123.txt
123
root@swi-mdm9x28-wp:~# rm /tmp/123.txt
root@swi-mdm9x28-wp:~# ls /tmp/
hello6.wp76xx.update legato test.sh
hosts pkgdwl thermal_engi_ipc
ld.so.cache psm_socket tmpfdbtable.txt
ld.so.conf sock0
root@swi-mdm9x28-wp:~# update /tmp/hello6.wp76xx.update
Unpacking package: 100% ++++++++++++++++++++++++++++++++++++++++++++++++++
Applying update: 100% ++++++++++++++++++++++++++++++++++++++++++++++++++
SUCCESS
root@swi-mdm9x28-wp:~# app status
[running] atAirVantage
[running] atQmiLinker
[running] atService
[running] audioService
[running] avcService
[running] cellNetService
[running] dataConnectionService
[running] fwupdateService
[running] gpioService
[running] modemService
[running] portService
[running] positioningService
[running] powerMgr
[running] qmiAirVantage
[running] secStore
[stopped] smsInboxService
[stopped] spiService
[stopped] tools
[stopped] voiceCallService
[stopped] wifi
[stopped] wifiApTest
[stopped] wifiClientTest
[running] wifiService
[stopped] wifiWebAp
[stopped] hello6
root@swi-mdm9x28-wp:~# ls /tmp/
hello6.wp76xx.update legato test.sh
hosts pkgdwl thermal_engi_ipc
ld.so.cache psm_socket tmpfdbtable.txt
ld.so.conf sock0
root@swi-mdm9x28-wp:~# app start hello6
root@swi-mdm9x28-wp:~# ls /tmp/
123.txt ld.so.conf sock0
hello6.wp76xx.update legato test.sh
hosts pkgdwl thermal_engi_ipc
ld.so.cache psm_socket tmpfdbtable.txt
root@swi-mdm9x28-wp:~#