diff --git a/platformio.ini b/platformio.ini
index e6f61d37..ec1e44fe 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1618,6 +1618,7 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   ; -D SR_DEBUG
   ; -D MIC_LOGGER
   ${common_mm.HUB75_build_flags}
+  -D SR_DMTYPE=254 ;; HUB75 driver needs the I2S unit - set AR default mode to 'Network Receive Only' to prevent driver conflicts.
   -D WLED_DISABLE_PARTICLESYSTEM1D ;; exceeds flash size limit
 lib_deps = ${esp32_4MB_V4_S_base.esp32_lib_deps}
     ${common_mm.HUB75_lib_deps}
@@ -1642,6 +1643,7 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   ; -D SR_DEBUG
   ; -D MIC_LOGGER
   ${common_mm.HUB75_build_flags}
+  -D SR_DMTYPE=254 ;; HUB75 driver needs the I2S unit - set AR default mode to 'Network Receive Only' to prevent driver conflicts.
   -D WLED_USE_ETHERNET
   -D WLED_DISABLE_ESPNOW ;; ESP-NOW requires wifi, may crash with ethernet only
 lib_deps = ${esp32_4MB_V4_S_base.esp32_lib_deps}
@@ -1684,7 +1686,8 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   ;; -D SR_DEBUG
   -D WLED_BOOTUPDELAY=350
   ${common_mm.HUB75_build_flags}
-  -DESP32_FORUM_PINOUT 
+  -DESP32_FORUM_PINOUT
+  -D SR_DMTYPE=254 ;; HUB75 driver needs the I2S unit - set AR default mode to 'Network Receive Only' to prevent driver conflicts.
   ${common_mm.animartrix_build_flags}
   ;;-DARDUINO_EVENT_RUNNING_CORE=0  ;; assign Wifi to core0, to have more CPU on core#1 (arduino loop)
   ;;-DARDUINO_RUNNING_CORE=1        ;; should be default, but does not hurt
@@ -1747,6 +1750,7 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   -D JSON_BUFFER_SIZE=18432 -D MIN_HEAP_SIZE=6144
   -D MAX_SEGMENT_DATA=40960  ;; default 32767
   ${common_mm.HUB75_build_flags}
+  -D SR_DMTYPE=254 ;; HUB75 driver needs the I2S unit - set AR default mode to 'Network Receive Only' to prevent driver conflicts.
   ${common_mm.animartrix_build_flags}
 lib_deps = ${esp32_4MB_V4_S_base.esp32_lib_deps}
     ${common_mm.HUB75_lib_deps}
@@ -1773,6 +1777,7 @@ build_flags = ${esp32_4MB_V4_M_base.esp32_build_flags}
   -D FLD_PIN_SCL=-1 -D FLD_PIN_SDA=-1 ; use global!
   -D HW_PIN_SCL=22 -D HW_PIN_SDA=21
   ${common_mm.HUB75_build_flags}
+  -D SR_DMTYPE=254 ;; HUB75 driver needs the I2S unit - set AR default mode to 'Network Receive Only' to prevent driver conflicts.
   ${common_mm.animartrix_build_flags}
 lib_deps = ${esp32_4MB_V4_M_base.esp32_lib_deps}
     ${common_mm.HUB75_lib_deps}
@@ -1835,6 +1840,7 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   ; -D SR_DEBUG
   ; -D MIC_LOGGER
   ${common_mm.HUB75_build_flags}
+  -D SR_DMTYPE=254 ;; HUB75 driver needs the I2S unit - set AR default mode to 'Network Receive Only' to prevent driver conflicts.
 lib_deps = ${esp32_4MB_V4_S_base.esp32_lib_deps}
     ${common_mm.HUB75_lib_deps}
 lib_ignore =
@@ -1886,6 +1892,7 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   ; -D SR_DEBUG
   ; -D MIC_LOGGER
   ${common_mm.HUB75_build_flags}
+  -D SR_DMTYPE=254 ;; HUB75 driver needs the I2S unit - set AR default mode to 'Network Receive Only' to prevent driver conflicts.
 lib_deps = ${esp32_4MB_V4_S_base.esp32_lib_deps}
     ${common_mm.HUB75_lib_deps}
 lib_ignore =