Samsung Galaxy S 2 (WiMAX) ISW11SC Firmware Overview
What is the latest ISW11SC firmware?
ISW11SCKDNE3, released May 21, 2014 with Android 4.0. The archive holds 3 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy S 2 (WiMAX) still getting updates?
Most likely not: there has been no new firmware since May 2014, so Android 4.0 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All ISW11SC firmware builds
How to Flash ISW11SC Firmware
Put the Samsung Galaxy S 2 (WiMAX) into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Use HOME_CSC to keep your data, CSC for a full wipe.