Hi!
If a recent SurPad 4.2 update no longer works on your older controller or tablet, your device may be running a 32-bit Android system. Newer SurPad releases support only 64-bit systems.
I’m sharing the last SurPad 4.2 version that supports 32-bit Android systems:
Download: https://surpadapp.com/app/Surpad_esurvey_v4.2.260413.163610_42260413163610_jiagu_sign.apk
If your device runs a 32-bit system, please keep this version and avoid updating to newer releases.
To use the latest features and fixes, you will need a device running a compatible 64-bit Android system.