The WiFi chipset specs may help diagnose network connectivity issues with the v4.
ie. adjust advanced router settings: WPA3 support, increase modulation to 1024QAM, data rate 11, turn on DL/UL MU-MIMO, OFDMA, etc.
WiFi Chipset:Altobeam ATBM6062
ATBM6062 series is highly integrated IEEE 802.11b/g/n/ax and Bluetooth LE v5.0 Combo chip with USB or SDIO interface.
General features
• Intergrated low power MCU, 2.4GHz RF, WiFi4/6 baseband, MAC
• Integrated PA, LNA, Balun and T/R switch
• Support 802.11n Short-GI
• Support 20MHz and 40MHz channel bandwidth
• Support STA, AP and STA+AP modes
• Support BSS, P2P and function
• Support A-MSDU and STBC stream reception
• Support WPA, WPA2, WPA3 personal
• Support 24MHz(default) and 40MHz crystal and external clock
• 5x5 QFN32 package
********* * WiFi6 FEATURES * **********
• Support 802.11n/ax LDPC TX and RX
• Support 1024QAM modulation
• Support all data rates of MSC0 to 11, up to 286.8Mbps for both TX and RX
• Support DL/UL MU-MIMO, OFDMA
Bluetooth features
• Support Bluetooth LE v5.0 standards
• Support BLE Coded PHY (Long range)
• Tx power Max.14dBm (class 1)
• Support BLE 1Mbps and 2Mbps
SoC: Ingenic T41
Credit to Taptic Digital for the teardown video. Check out his channel here https://youtube.com/@tapticdigital?si=QtknqAkmMoDr--8-