Flashing the Modem on Pine Phone Pro (Take 2)

Enabling SSH
Installing needed tools
Establishing a baseline
Pins & Diagrams
First Reboot

Just keeping a journal of changes made. Going to take another stab at fixing this modem by jumping some test pins.

The phone is currently disasembled which means the buttons are taken off and they must be pressed carefully with a pen/etc. This presents a challenge as the pins need to be jumped WHILE HOLDING the down-volume to boot from the SD card. So the first step will be installing a working OS on the internal eMMC. This will allow the phone to be booted without having to hold down any buttons.

# Mount phone as usb, plug into usb to power on while holding vol-up
# Mounts at /dev/sda

sudo dd if=20260213-0052-postmarketOS-v25.12-phosh-25-pine64-pinephonepro.img of=/dev/sda

# This was very slow, set bs=16M next time

Enabling SSH

# On the phone
sudo apk add openssh
sudo systemctl start sshd
sudo systemctl enable sshd

Installing needed tools

# ssh'd in
sudo su -

apk add git
apk add android-tools

mkdir Modem
cd ~/Modem

git clone https://github.com/Biktorgj/quectel_eg25_recovery.git

Establishing a baseline

pine64-pinephonepro:~/Modem# lsusb 
Bus 003 Device 001: ID 1d6b:0001 Linux 6.17.7 ohci_hcd Generic Platform OHCI controller
Bus 002 Device 002: ID 2c7c:0125 Quectel EG25-G
Bus 001 Device 001: ID 1d6b:0002 Linux 6.17.7 ehci_hcd EHCI Host Controller
Bus 004 Device 001: ID 1d6b:0001 Linux 6.17.7 ohci_hcd Generic Platform OHCI controller
Bus 002 Device 001: ID 1d6b:0002 Linux 6.17.7 ehci_hcd EHCI Host Controller

Pins & Diagrams

Found this thread at pine64.org of someone trying to do the same. The test pins are not labeled as well for the pro edition but they found out which pins need to be shorted by asking around on the forums. Came back with this image:

So let's reboot, short the pins, and see what happens.

First Reboot

Godamn it worked! Held my bent-paper-clip in place while the phone rebooted and came up with a "no modem" symbol in the upper-right.