diff --git a/firmware/rust/src/screen/setup.rs b/firmware/rust/src/screen/setup.rs
index a06ee70..91cb2e2 100644
--- a/firmware/rust/src/screen/setup.rs
+++ b/firmware/rust/src/screen/setup.rs
@@ -35,7 +35,7 @@ impl Setup {
             Selection::BacklightEdit => match input {
                 Input::Next => {
                     self.backlight = if self.backlight == u8::MAX {
-                        u8::MIN
+                        u8::MAX
                     } else {
                         self.backlight + 1
                     };
@@ -44,7 +44,7 @@ impl Setup {
                 }
                 Input::Previous => {
                     self.backlight = if self.backlight == u8::MIN {
-                        u8::MAX
+                        u8::MIN
                     } else {
                         self.backlight - 1
                     };
@@ -70,7 +70,7 @@ impl Setup {
             Selection::ContrastEdit => match input {
                 Input::Next => {
                     self.contrast = if self.contrast >= 63 {
-                        u8::MIN
+                        63
                     } else {
                         self.contrast + 1
                     };
@@ -79,7 +79,7 @@ impl Setup {
                 }
                 Input::Previous => {
                     self.contrast = if self.contrast == u8::MIN {
-                        63
+                        u8::MIN
                     } else {
                         self.contrast - 1
                     };