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Hi Sergey,
Good news, your GPIO part worked perfectly.
gpio119 : out high confirms esim1_en is HIGH.
The gpioget ... Device or resource busy is harmless: the legacy sysfs export claimed the line, so the char-device gpioget can't grab it. Ignore it.

The reason it's still sim-missing: the modem ...

Hi :)
try:
# esim1_en = 509, esim2_en = 404, esim3_en = 402, sim_hotplug = 504
for g in 509 404 402 504; do echo $g > /sys/class/gpio/export 2>/dev/null; done

# match stock Android EXACTLY — direction first, then value
echo out > /sys/class/gpio/gpio509/direction; echo 1 > /sys/class/gpio/gpio509 ...

Get the reference from stock EDL Android.
Boot stock, insert a physical SIM, confirm it registers, then "cat /sys/kernel/debug/gpio".
That dump is the exact known-good state of esim1/2/3_en + sim_hotplug.
Replicate those states under Handsomes Mobian, then compare.

Under Mobian:
install gpiod ...

how did it worked?
do you still need any help?

Project Ideas — What Can You Do With a $8 Linux Server?

The OpenStick gives you a full Debian Linux system with LTE, WiFi, and USB in a tiny USB stick form factor. Here are some ideas to get you started.

Portable SSH Jump Host
Plug it into any USB charger, insert a SIM card, and you have a ...

Building a Custom Kernel for Your Device

For advanced users who want to customize their kernel or add hardware support.

Prerequisites
You need a Linux PC (x86_64) for cross-compilation:
sudo apt install build-essential gcc-aarch64-linux-gnu bc bison flex libssl-dev
sudo apt install device ...

Display Support — GC9107, ST7735, ILI9341, Framebuffer

Some OpenStick models have built-in displays, and you can also connect external SPI displays.

MF800B-E LCD — Built-in GC9107 Display
The MF800B-E LCD model comes with a 128x128 pixel GC9107 display connected via SPI. When properly ...

Common Boot Problems & Solutions

A collection of the most common issues after flashing and how to fix them.

Stuck at Boot Logo
Cause: Wrong kernel/boot image for your device model.
Fix: Enter EDL mode and re-flash the boot partition with the correct image for your specific board.

Boot Loop ...

Bricked? EDL 9008 Recovery Guide

Do not panic. If your device does not boot, you can almost always recover it using Qualcomm EDL (Emergency Download) mode.

What is EDL 9008 Mode?
EDL (Emergency Download) is a Qualcomm low-level recovery mode that works even if the bootloader is corrupted. It ...

USB Gadget Networking (RNDIS/ECM)

When you plug your OpenStick into a PC, it appears as a USB Ethernet adapter. This is the primary way to access the device for initial setup.

Default Configuration
By default, the OpenStick uses RNDIS (Remote Network Driver Interface Specification) to create a ...