Correct the way nanoff chooses the partition to erase. (#53)

***NO_CI***

Author: gukoff

nanoFirmwareFlasher/Esp32Firmware.cs

@@ -21,6 +21,8 @@ internal class Esp32Firmware : FirmwarePackage
         /// </summary>
         internal List<int> SupportedFlashSizes => new List<int> { 0x200000, 0x400000, 0x800000, 0x1000000 };
 
+        internal string BootloaderPath;
+
         internal Dictionary<int, string> FlashPartitions;
 
 
@@ -53,11 +55,13 @@ internal async System.Threading.Tasks.Task<ExitCodes> DownloadAndExtractAsync(in
 
             if (executionResult == ExitCodes.OK)
             {
+                BootloaderPath = "bootloader.bin";
+                
                 // get ESP32 partitions
                 FlashPartitions = new Dictionary<int, string>()
                 {
 				    // bootloader goes to 0x1000
-				    { 0x1000, Path.Combine(LocationPath, "bootloader.bin") },
+				    { 0x1000, Path.Combine(LocationPath, BootloaderPath) },
 
 				    // nanoCLR goes to 0x10000
 				    { 0x10000, Path.Combine(LocationPath, "nanoCLR.bin") },

nanoFirmwareFlasher/Esp32Operations.cs

@@ -168,9 +168,7 @@ internal static async System.Threading.Tasks.Task<ExitCodes> UpdateFirmwareAsync
                 // need to get deployment address here
                 // length must both be multiples of the SPI flash erase sector size. This is 0x1000 (4096) bytes for supported flash chips.
 
-                var flashPartition = firmware.FlashPartitions.First();
-
-                var fileStream = File.OpenRead(flashPartition.Value);
+                var fileStream = File.OpenRead(firmware.BootloaderPath);
 
                 uint fileLength = (uint)Math.Ceiling((decimal)fileStream.Length / 0x1000) * 0x1000;