Main PCB Backside Close Up View. Please leave a comment if you know information about U1, U26, and U42

U21 - I2C Single Cell 3A Charger, TI BQ25898

Winbond 8M x 8 Banks x 16 Bit, W631GU6MB121

U1 Part Markings: OA00805-B56G, TIVH62. Appears to be the video image processor

U7 - Cypress Ultra-Low Power, 802.11a/b/g/n WiFi/BLuetooth 5.0 Controller

U26, and U42 Part Markings: PA61, TI 871, A241, and 851DD, TI 838, A827

RF Front end with RF Switches, RF Bandpass Filter, and possible a RF PA

Dual WiF / Bluetooth Antennas