Full specifications

4 x ARM Cortex A53 cores @ 1.152 GHz
ARM Mali 400 MP2 GPU
2GB / 3GB LPDDR3 RAM
5.95″ LCD 1440×720, 18:9 aspect ratio (hardened glass)
Bootable Micro SD
16GB / 32GB eMMC
HD digital video out
USB Type C (Power, Data and Video Out)
Quectel EG25-G with worldwide bands
Built-in 802.11 b/g/n WiFi with Bluetooth: 4.0
GNSS: GPS, GPS-A, GLONASS
Vibration motor
RGB status LED
Selfie and Main camera (2/5Mpx respectively)
Main Camera: Single OV5640, 5MP, 1/4″, LED Flash
Selfie Camera: Single GC2035, 2MP, f/2.8, 1/5″
Sensors: accelerator, gyro, proximity, compass, ambient light
3 External Switches: volume up, volume down, and power
Hardware switches: LTE/GNSS, WiFi, Microphone, Speaker, Cameras
Six pogo pins allowing for custom hardware extensions such as a thermal camera, wireless charging, NFC, a extended battery case, or keyboard case
Samsung J7 form-factor 3000mAh battery
Case is matte black finished plastic
Headphone jack

postmarketos

https://wiki.postmarketos.org/wiki/PINE64_PinePhone_(pine64-pinephone)#Installation

wget https://images.postmarketos.org/bpo/v21.12/pine64-pinephone/sxmo-de-sway/20220202-0445/20220202-0445-postmarketOS-v21.12-sxmo-de-sway-1.7.0-pine64-pinephone.img.xz

dpavlin@nuc:/tmp$ xz --decompress --stdout 20220202-0445-postmarketOS-v21.12-sxmo-de-sway-1.7.0-pine64-pinephone.img.xz | \
 sudo dd of=/dev/sdc bs=4M status=progress iflag=fullblock oflag=direct conv=fsync

modem upgrade

https://github.com/the-modem-distro/pinephone_modem_sdk/

https://github.com/the-modem-distro/pinephone_modem_sdk/blob/kirkstone/docs/AT_INTERFACE.md

pine64-pinephone:~$ sh -x ./modem-serial.sh
+ sudo picocom --echo --omap ignlf /dev/ttyUSB2

ati

Quectel
EG25
Revision: EG25GGBR07A07M2G

OK

# battery
AT+CBC

+CBC: 0,93,4114

# versions
AT+CGMI

Quectel

AT+CGMM

EG25

AT+CGMR

EG25GGBR07A07M2G

# Get ADSP firmware version
AT+QGMR

EG25GGBR07A07M2G_01.002.01.002

https://github.com/the-modem-distro/pinephone_modem_sdk/blob/kirkstone/docs/FLASHING.md#adsp-versions