diff --git a/firmware/src/main.c b/firmware/src/main.c
index 69aaae6..1829d80 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -68,6 +68,8 @@ static const __flash uint8_t sym_b[] = { 0xFC, 0xFC, 0x8C, 0x8C, 0xFC, 0x78,
                                          0x3F, 0x3F, 0x31, 0x31, 0x3F, 0x1E };
 static const __flash uint8_t sym_c[] = { 0xF8, 0xFC, 0x0C, 0x1C, 0x18,
                                          0x1F, 0x3F, 0x30, 0x38, 0x18 };
+static const __flash uint8_t sym_d[] = { 0xFC, 0xFC, 0x0C, 0x1C, 0xF8, 0xF0,
+                                         0x3F, 0x3F, 0x30, 0x38, 0x1F, 0x0F };
 static const __flash uint8_t sym_e[] = { 0xFC, 0xFC, 0x8C, 0x8C, 0x0C,
                                          0x3F, 0x3F, 0x31, 0x31, 0x30 };
 static const __flash uint8_t sym_g[] = { 0xF8, 0xFC, 0x0C, 0x0C, 0x3C, 0x38,
@@ -80,6 +82,8 @@ static const __flash uint8_t sym_k[] = { 0xFC, 0xFC, 0xC0, 0xF0, 0x7C, 0x1C,
                                          0x3F, 0x3F, 0x03, 0x0F, 0x3E, 0x38 };
 static const __flash uint8_t sym_l[] = { 0xFC, 0xFC, 0x00, 0x00, 0x00,
                                          0x3F, 0x3F, 0x30, 0x30, 0x30 };
+static const __flash uint8_t sym_m[] = { 0xFC, 0xFC, 0x38, 0x70, 0xE0, 0x70, 0x38, 0xFC, 0xFC,
+                                         0x3F, 0x3F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3F, 0x3F };
 static const __flash uint8_t sym_n[] = { 0xFC, 0xFC, 0xF0, 0xC0, 0x00, 0xFC, 0xFC,
                                          0x3F, 0x3F, 0x00, 0x03, 0x0F, 0x3F, 0x3F };
 static const __flash uint8_t sym_o[] = { 0xF8, 0xFC, 0x0C, 0x0C, 0xFC, 0xF8,
@@ -93,7 +97,7 @@ static const __flash uint8_t sym_s[] = { 0xF8, 0xFC, 0x8C, 0x8C, 0x9C, 0x18,
 static const __flash uint8_t sym_t[] = { 0x0C, 0x0C, 0xFC, 0xFC, 0x0C, 0x0C,
                                          0x00, 0x00, 0x3F, 0x3F, 0x00, 0x00 };
 static const __flash uint8_t sym_u[] = { 0xFC, 0xFC, 0x00, 0x00, 0xFC, 0xFC,
-                                         0x3F, 0x3F, 0x30, 0x30, 0x3F, 0x3F };
+                                         0x1F, 0x3F, 0x30, 0x30, 0x3F, 0x1F };
 
 static const __flash uint8_t sym_underscore[] = { 0x00, 0x00, 0x00, 0x00, 0x00,
                                                   0x20, 0x20, 0x20, 0x20, 0x20 };
@@ -126,7 +130,7 @@ static const struct symbol symbol_table[] = { SYM_ENTRY(sym_0),
                                               SYM_ENTRY(sym_a),
                                               SYM_ENTRY(sym_b),
                                               SYM_ENTRY(sym_c),
-                                              SYM_ENTRY(sym_invalid),
+                                              SYM_ENTRY(sym_d),
                                               SYM_ENTRY(sym_e),
                                               SYM_ENTRY(sym_invalid),
                                               SYM_ENTRY(sym_g),
@@ -135,7 +139,7 @@ static const struct symbol symbol_table[] = { SYM_ENTRY(sym_0),
                                               SYM_ENTRY(sym_invalid),
                                               SYM_ENTRY(sym_k),
                                               SYM_ENTRY(sym_l),
-                                              SYM_ENTRY(sym_invalid),
+                                              SYM_ENTRY(sym_m),
                                               SYM_ENTRY(sym_n),
                                               SYM_ENTRY(sym_o),
                                               SYM_ENTRY(sym_p),