Rm502 not booting

Tufozz · May 9, 2025, 3:43pm

Hi guys!
I’m chiara from Italy and sending you some request since my bf can’t fix this product.

this module installed on a zyxel device.
During and update the module stopped working and now it bootloop every time he tries to update it.
It connected.it via UART, flashed with z-loader but still at the same point…device is not recognized by the modem

Attaching some picture to the topic maybe some expert help boyfriend fix it.

Thanks in advance

Tufozz · May 9, 2025, 4:46pm

Tufozz · May 10, 2025, 12:34pm

@silvia can you support me ?
photo_2025-03-12_20-14-24

silvia · May 12, 2025, 6:28am

Dear @Tufozz
Actually, we don’t know how to upgrade the firmware with Zyxel, you can contact with manufacture of Zyxel.
Or you can try to uninstall the module, install in other device and try to upgrade.

Tufozz · May 12, 2025, 7:35am

@silvia
thanks for the reply…
the problem is that is not a problem with zyxel… I installed openwrt, and the module is not working…
it’s a problem with quectel module… in particular restore the functionality …
what test can i perform thorught UART port?

silvia · May 13, 2025, 8:02am

Dear @Tufozz
Did you see any port in your system? like ttyUSB or others?

Tufozz · May 13, 2025, 8:19am

thanks @silvia …
at the time i found those but i don’t know if they are real / not working or what…

Tufozz · May 15, 2025, 7:45am

any update?
thanks in advance

jfrog · May 15, 2025, 8:51am

Show the output of cat /sys/kernel/debug/usb/devices
No pictures please.

Tufozz · May 18, 2025, 9:56am

@jfrog
cat /sys/kernel/debug/usb/devices

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 2
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 6.06
S: Manufacturer=Linux 6.6.73 xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=1e1c0000.xhci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms

T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=5000 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 3.00 Cls=09(hub ) Sub=00 Prot=03 MxPS= 9 #Cfgs= 1
P: Vendor=1d6b ProdID=0003 Rev= 6.06
S: Manufacturer=Linux 6.6.73 xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=1e1c0000.xhci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms
root@OpenWrt:~# ^C

jfrog · May 18, 2025, 9:57am

You have no Quectel devices on USB.

Tufozz · May 18, 2025, 10:58am

root@OpenWrt:~# ls -l /dev/ttyUSB*
ls: /dev/ttyUSB*: No such file or directory
root@OpenWrt:~# ls -l /dev/ttyusb*
ls: /dev/ttyusb*: No such file or directory
root@OpenWrt:~# ls /dev/tty*
/dev/tty /dev/ttyS10 /dev/ttyS13 /dev/ttyS2 /dev/ttyS5 /dev/ttyS8
/dev/ttyS0 /dev/ttyS11 /dev/ttyS14 /dev/ttyS3 /dev/ttyS6 /dev/ttyS9
/dev/ttyS1 /dev/ttyS12 /dev/ttyS15 /dev/ttyS4 /dev/ttyS7
root@OpenWrt:~# dmesg | grep tty
[ 0.000000] Kernel command line: console=ttyS0,57600 rootfstype=squashfs,jffs2
[ 2.294153] printk: console [ttyS0] disabled
[ 2.303420] 1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 18, base_baud = 3125000) is a 16550A
[ 2.321405] printk: console [ttyS0] enabled
root@OpenWrt:~#

luca, [18/05/25 12:04]
root@OpenWrt:~# cat /sys/kernel/debug/usb/devices

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 2
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 6.06
S: Manufacturer=Linux 6.6.73 xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=1e1c0000.xhci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms

T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=5000 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 3.00 Cls=09(hub ) Sub=00 Prot=03 MxPS= 9 #Cfgs= 1
P: Vendor=1d6b ProdID=0003 Rev= 6.06
S: Manufacturer=Linux 6.6.73 xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=1e1c0000.xhci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms
root@OpenWrt:~# opkg list-installed | grep kmod-usb-serial-option
kmod-usb-serial-option - 6.6.73-r1
root@OpenWrt:~# ^C

root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~# lsusb
-ash: lsusb: not found
root@OpenWrt:~# lsusb -t
-ash: lsusb: not found
root@OpenWrt:~#

luca, [18/05/25 12:07]
root@OpenWrt:~# opkg update
pkg install uqmiDownloading
Failed to send request: Operation not permitted
*** Failed to download the package list from

Failed to send request: Operation not permitted
*** Failed to download the package list from

D
Failed to send request: Operation not permitted
*** Failed to download the package list from

Downloading
Failed to send request: Operation not permitted
*** Failed to download the package list from https

Failed to send request: Operation not permitted
*** Failed to download the package list from

Downloading s.gz
Failed to send request: Operation not permitted
*** Failed to download the package list from ì

Collected errors:

opkg_download: Failed to download 4.
opkg_download: Check your network settings and connectivity.
opkg_download: Failed to download .
opkg_download: Check your network settings and connectivity.
opkg_download: Failed to download
opkg_download: Check your network settings and connectivity.
opkg_download: Failed to download
opkg_download: Check your network settings and connectivity.
opkg_download: Failed to download * opkg_download: Check your network settings and connectivity.
opkg_download: Failed to download
opkg_download: Check your network settings and connectivity.
opkg_download: Failed to download
opkg_download: Check your network settings and connectivity.

jfrog · May 18, 2025, 11:01am

@Tufozz, this is not OpenWrt forum.

Tufozz · May 18, 2025, 11:48am

ok, i don’t find any help from your last 2 posts.
this is not openwrt.

root@OpenWrt:~# ls -l /dev/ttyUSB*
ls: /dev/ttyUSB*: No such file or directory
root@OpenWrt:~# ls -l /dev/ttyusb*
ls: /dev/ttyusb*: No such file or directory
root@OpenWrt:~# ls /dev/tty*
/dev/tty /dev/ttyS10 /dev/ttyS13 /dev/ttyS2 /dev/ttyS5 /dev/ttyS8
/dev/ttyS0 /dev/ttyS11 /dev/ttyS14 /dev/ttyS3 /dev/ttyS6 /dev/ttyS9
/dev/ttyS1 /dev/ttyS12 /dev/ttyS15 /dev/ttyS4 /dev/ttyS7
root@OpenWrt:~# dmesg | grep tty
[ 0.000000] Kernel command line: console=ttyS0,57600 rootfstype=squashfs,jffs2
[ 2.294153] printk: console [ttyS0] disabled
[ 2.303420] 1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 18, base_baud = 3125000) is a 16550A
[ 2.321405] printk: console [ttyS0] enabled

jfrog · May 18, 2025, 11:51am

I can’t help until I see some useful information.
Since you have a Zyxel device, you will need to contact Zyxel for assistance.

Tufozz · May 20, 2025, 7:24am

since i’m here… i already contacted zyxel and they said it’s a matter of quectel component…
@jfrog thanks for the effort but you are not helping me.

@silvia please help me …

jfrog · May 20, 2025, 7:40am

then tell them you bought a complete device from them and not a box full of components

Since you’re using OpenWrt to recover your modem and the modem is not even detected there, I suggest you to raise a question in OpenWrt forum.

silvia · May 22, 2025, 9:07am

Dear @Tufozz
Actually, if your device is Zyxel, it is better to contact with them.
We don’t know why the device didn’t recognize the module.

jfrog · May 22, 2025, 9:31am

@silvia You are answering to a wrong person

silvia · May 22, 2025, 10:55am

Dear @jfrog
Thanks for your reminder.