diff --git a/sdkconfig.defaults b/sdkconfig.defaults
index f44fce5..7b6a5b9 100644
--- a/sdkconfig.defaults
+++ b/sdkconfig.defaults
@@ -44,10 +44,10 @@ CONFIG_FLASHMODE_DIO=y
 # CONFIG_FLASHMODE_DOUT is not set
 CONFIG_ESPTOOLPY_FLASHMODE="dio"
 # CONFIG_ESPTOOLPY_FLASHFREQ_80M is not set
-CONFIG_ESPTOOLPY_FLASHFREQ_40M=y
-# CONFIG_ESPTOOLPY_FLASHFREQ_26M is not set
+# CONFIG_ESPTOOLPY_FLASHFREQ_40M is not set
+CONFIG_ESPTOOLPY_FLASHFREQ_26M=y
 # CONFIG_ESPTOOLPY_FLASHFREQ_20M is not set
-CONFIG_ESPTOOLPY_FLASHFREQ="40m"
+CONFIG_ESPTOOLPY_FLASHFREQ="26m"
 # CONFIG_ESPTOOLPY_FLASHSIZE_1MB is not set
 CONFIG_ESPTOOLPY_FLASHSIZE_2MB=y
 # CONFIG_ESPTOOLPY_FLASHSIZE_4MB is not set