Update boards.txt

Co-authored-by: Frederic Pillon <[email protected]>
Signed-off-by: Aurentiaco35 <[email protected]>

Author: Aurentiaco35

boards.txt

@@ -7986,7 +7986,7 @@ GenH7.menu.pnum.GENERIC_H7A3VIHX.build.variant=STM32H7xx/H7A3V(G-I)(H-T)_H7B0VBT
 # Generic H7A3VGTx
 GenH7.menu.pnum.GENERIC_H7A3VGTX=Generic H7A3VGTx
 GenH7.menu.pnum.GENERIC_H7A3VGTX.upload.maximum_size=1048576
-GenH7.menu.pnum.GENERIC_H7A3VGTX.upload.maximum_data_size=1458176
+GenH7.menu.pnum.GENERIC_H7A3VGTX.upload.maximum_data_size=1048576
 GenH7.menu.pnum.GENERIC_H7A3VGTX.build.board=GENERIC_H7A3VGTX
 GenH7.menu.pnum.GENERIC_H7A3VGTX.build.product_line=STM32H7A3xx
 GenH7.menu.pnum.GENERIC_H7A3VGTX.build.variant=STM32H7xx/H7A3V(G-I)(H-T)_H7B0VBT_H7B3VI(H-T)