Can't readback large ROMs from phone? Solution:
1. Disable ModemManager
Linux's ModemManager often tries to grab the phone's port because it detects a serial device (/dev/ttyACM0). This causes the connection to drop and SP Flash Tool to crash.
Temporarily stop :
sudo systemctl stop ModemManager
sudo systemctl disable ModemManager
2. Check udev Rules
Kubuntu needs to be told to ignore the MediaTek device to prevent the kernel from interfering.
Create a new udev rule file:
sudo nano /etc/udev/rules.d/20-mm-blacklist-mtk.rules
Add this line to tell ModemManager to ignore your device:
ATTRS{idVendor}=="0e8d", ENV{ID_MM_DEVICE_IGNORE}="1"
Add another rule for user permissions:
SUBSYSTEM=="usb", ATTR{idVendor}=="0e8d", MODE="0666"
Reload rules:
sudo udevadm control --reload-rules
sudo udevadm trigger
