diff --git a/src/pages/EquipmentPage.tsx b/src/pages/EquipmentPage.tsx
index 532a471..6ae163b 100644
--- a/src/pages/EquipmentPage.tsx
+++ b/src/pages/EquipmentPage.tsx
@@ -202,15 +202,16 @@ function DeviceForm({
   const [purpose, setPurpose]         = useState(initial?.purpose ?? 'receipt')
   const [fiscalMode, setFiscalMode]   = useState(initial?.fiscalMode !== false)
   const [dtoPort, setDtoPort]         = useState(String(initial?.dtoPort ?? 16732))
-  const [dtoUser, setDtoUser]         = useState(String(initial?.config?.dto_user ?? '30'))
-  const [dtoPass, setDtoPass]         = useState(String(initial?.config?.dto_pass ?? '30'))
-  const [dtoDeviceId, setDtoDeviceId] = useState(String(initial?.config?.dto_device_id ?? ''))
+  // config keys come from API already camelCased by transformKeys
+  const [dtoUser, setDtoUser]         = useState(String((initial?.config as any)?.dtoUser ?? (initial?.config as any)?.dto_user ?? '30'))
+  const [dtoPass, setDtoPass]         = useState(String((initial?.config as any)?.dtoPass ?? (initial?.config as any)?.dto_pass ?? '30'))
+  const [dtoDeviceId, setDtoDeviceId] = useState(String((initial?.config as any)?.dtoDeviceId ?? (initial?.config as any)?.dto_device_id ?? ''))
   const [saving, setSaving]           = useState(false)
   const [availablePorts, setAvailablePorts]       = useState<{ port: string; description?: string }[] | null>(null)
   const [portsLoading, setPortsLoading]           = useState(false)
   const [availablePrinters, setAvailablePrinters] = useState<{ name: string; isDefault: boolean }[] | null>(null)
   const [printersLoading, setPrintersLoading]     = useState(false)
-  const [windowsPrinter, setWindowsPrinter]       = useState(String(initial?.config?.windows_printer ?? ''))
+  const [windowsPrinter, setWindowsPrinter]       = useState(String((initial?.config as any)?.windowsPrinter ?? (initial?.config as any)?.windows_printer ?? ''))
 
   const loadPorts = () => {
     if (!wsOnline) return