From 9d6d53a71a0f1a84cb337bdf6bff1d2497347feb Mon Sep 17 00:00:00 2001
From: Und3r_1337 <dev@chappe05.fr>
Date: Wed, 16 Sep 2026 00:03:54 +0200
Subject: [PATCH] fix(config): allow digits in config keys so keys like gr_1hop
 round-trip

---
 src/helpers/ConfigSerializer.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/helpers/ConfigSerializer.cpp b/src/helpers/ConfigSerializer.cpp
index 36aff5ccf..daf834b2b 100644
--- a/src/helpers/ConfigSerializer.cpp
+++ b/src/helpers/ConfigSerializer.cpp
@@ -24,7 +24,9 @@ static bool is_whitespace(char c) {
   return c == ' ' || c == '\t' || c == '\r' || c == '\n';
 }
 static bool is_key_char(char c) {
-  return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_';
+  // digits are allowed: keys like gr_1hop contain one, otherwise loadSerial
+  // fails at that key and prefs stop reloading after a reboot
+  return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '_';
 }
 static bool is_value_char(char c) {
   return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || c == '-' || c == '.';