The android 4.x images were designed for the TS-TPC-8390-4900 and TS-TPC-8950-4900 boards.
The android 7.1.1-tsimx6-atmel image is designed for the TS-TPC-7990.
The android 7.1.1-tsimx6-tiwifi image is designed for the TS-TPC-8390-4900 / TS-TPC-8950-4900 / TS-7970