diff --git a/boards.txt b/boards.txt
index 189a8cac84..f08631d400 100644
--- a/boards.txt
+++ b/boards.txt
@@ -2073,15 +2073,6 @@ GenF0.menu.pnum.GENERIC_F042K4TX.build.product_line=STM32F042x6
 GenF0.menu.pnum.GENERIC_F042K4TX.build.variant=STM32F0xx/F042K(4-6)T
 GenF0.menu.pnum.GENERIC_F042K4TX.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32F0xx/STM32F0x2.svd
 
-# Generic F042K6Ux
-GenF0.menu.pnum.GENERIC_F042K6UX=Generic F042K6Ux
-GenF0.menu.pnum.GENERIC_F042K6UX.upload.maximum_size=32768
-GenF0.menu.pnum.GENERIC_F042K6UX.upload.maximum_data_size=6144
-GenF0.menu.pnum.GENERIC_F042K6UX.build.board=GENERIC_F042K6UX
-GenF0.menu.pnum.GENERIC_F042K6UX.build.product_line=STM32F042x6
-GenF0.menu.pnum.GENERIC_F042K6UX.build.variant=STM32F0xx/F042K(4-6)U
-GenF0.menu.pnum.GENERIC_F042K6UX.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32F0xx/STM32F0x2.svd
-
 # Generic F042K6Tx
 GenF0.menu.pnum.GENERIC_F042K6TX=Generic F042K6Tx
 GenF0.menu.pnum.GENERIC_F042K6TX.upload.maximum_size=32768
@@ -2091,6 +2082,24 @@ GenF0.menu.pnum.GENERIC_F042K6TX.build.product_line=STM32F042x6
 GenF0.menu.pnum.GENERIC_F042K6TX.build.variant=STM32F0xx/F042K(4-6)T
 GenF0.menu.pnum.GENERIC_F042K6TX.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32F0xx/STM32F0x2.svd
 
+# Generic F042K4Ux
+GenF0.menu.pnum.GENERIC_F042K4UX=Generic F042K4Ux
+GenF0.menu.pnum.GENERIC_F042K4UX.upload.maximum_size=16384
+GenF0.menu.pnum.GENERIC_F042K4UX.upload.maximum_data_size=6144
+GenF0.menu.pnum.GENERIC_F042K4UX.build.board=GENERIC_F042K4UX
+GenF0.menu.pnum.GENERIC_F042K4UX.build.product_line=STM32F042x6
+GenF0.menu.pnum.GENERIC_F042K4UX.build.variant=STM32F0xx/F042K(4-6)U
+GenF0.menu.pnum.GENERIC_F042K4UX.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32F0xx/STM32F0x2.svd
+
+# Generic F042K6Ux
+GenF0.menu.pnum.GENERIC_F042K6UX=Generic F042K6Ux
+GenF0.menu.pnum.GENERIC_F042K6UX.upload.maximum_size=32768
+GenF0.menu.pnum.GENERIC_F042K6UX.upload.maximum_data_size=6144
+GenF0.menu.pnum.GENERIC_F042K6UX.build.board=GENERIC_F042K6UX
+GenF0.menu.pnum.GENERIC_F042K6UX.build.product_line=STM32F042x6
+GenF0.menu.pnum.GENERIC_F042K6UX.build.variant=STM32F0xx/F042K(4-6)U
+GenF0.menu.pnum.GENERIC_F042K6UX.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32F0xx/STM32F0x2.svd
+
 # Generic F042T6Yx
 GenF0.menu.pnum.GENERIC_F042T6YX=Generic F042T6Yx
 GenF0.menu.pnum.GENERIC_F042T6YX.upload.maximum_size=32768