diff --git a/BootLoaders/Boards/boards.txt b/BootLoaders/Boards/boards.txt
index 6735147..928fdbd 100644
--- a/BootLoaders/Boards/boards.txt
+++ b/BootLoaders/Boards/boards.txt
@@ -38,7 +38,7 @@ multiatmega328p.menu.bootloader.none.bootloader.high_fuses=0xD7
 multiatmega328p.menu.bootloader.optiboot=Flash from TX
 multiatmega328p.menu.bootloader.optiboot.build.board=MULTI_FLASH_FROM_TX
 
-multiatmega328p.menu.bootloader.optiboot.upload.maximum_size=32512
+multiatmega328p.menu.bootloader.optiboot.upload.maximum_size=32256
 multiatmega328p.menu.bootloader.optiboot.bootloader.file=Multi4in1/AtmegaMultiBoot.hex
 multiatmega328p.menu.bootloader.optiboot.bootloader.high_fuses=0xD6
 
diff --git a/BootLoaders/package_multi_4in1_board_index.json b/BootLoaders/package_multi_4in1_board_index.json
index 1d5b725..911e9d5 100644
--- a/BootLoaders/package_multi_4in1_board_index.json
+++ b/BootLoaders/package_multi_4in1_board_index.json
@@ -19,7 +19,7 @@
           },
           "url": "https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/raw/master/BootLoaders/package_multi_4in1_board_v1.0.0.zip",
           "archiveFileName": "package_multi_4in1_board_v1.0.0.zip",
-          "checksum": "SHA-256:F5CF6502AB15B2BEC5F47CE0258DB9A1682CA3A4F2A4E490EA76F54961072483",
+          "checksum": "SHA-256:61AB463B5B91BCCBF285EB4C801B37E4F46138CA8762E4C04CCB09C2FF157CB7",
           "size": "3161",
           "boards": [
             {"name": "Multi 4-in-1 (Atmega328p, 3.3V, 16MHz)"}
diff --git a/BootLoaders/package_multi_4in1_board_v1.0.0.zip b/BootLoaders/package_multi_4in1_board_v1.0.0.zip
index af0bf24..b0f14fd 100644
Binary files a/BootLoaders/package_multi_4in1_board_v1.0.0.zip and b/BootLoaders/package_multi_4in1_board_v1.0.0.zip differ