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 rusEfi offers complete software download bundles for multiple supported microcontrollers and boards.
 
+# IMPORTANT NOTE: TunerStudio v3.1.04 or later is REQUIRED! Please double check the version before updating your firmware, or your settings could be lost when updating!
+
 ### Common Boards
 
 [microRusEfi 0.4 and newer (STM32F4)](https://rusefi.com/build_server/rusefi_bundle_mre_f4.zip)