Add UEFI Shell 26H1 downloads

* Also add retry on getting the SKU languages, as it may fail on first attempt.

Fido.ps1

@@ -1,5 +1,5 @@
 #
-# Fido v1.68 - ISO Downloader, for Microsoft Windows and UEFI Shell
+# Fido v1.69 - ISO Downloader, for Microsoft Windows and UEFI Shell
 # Copyright © 2019-2026 Pete Batard <pete@akeo.ie>
 # Command line support: Copyright © 2021 flx5
 # ConvertTo-ImageSource: Copyright © 2016 Chris Carter
@@ -159,6 +159,11 @@ $WindowsVersions = @(
 	)
 	@(
 		@("UEFI Shell 2.2", "UEFI_SHELL 2.2"),
+		@(
+			"26H1 (edk2-stable202602)",
+			@("Release", 0),
+			@("Debug", 1)
+		),
 		@(
 			"25H2 (edk2-stable202511)",
 			@("Release", 0),
@@ -668,8 +673,13 @@ function Get-Windows-Languages([int]$SelectedVersion, [object]$SelectedEdition)
 				Write-Host Querying $url
 			}
 			try {
+				# May require a few attempts.
+				$attempt = 0;
+				while ($true) {
+					if ($attempt -ne 0) { Start-Sleep -Seconds 2 }
 					$r = Invoke-RestMethod -UseBasicParsing -TimeoutSec $DefaultTimeout -SessionVariable "Session" $url
 					if ($r -eq $null) {
+						if ($attempt++ -le 1) { continue }
 						throw "Could not retrieve languages from server"
 					}
 					if ($Verbosity -ge 5) {
@@ -678,6 +688,7 @@ function Get-Windows-Languages([int]$SelectedVersion, [object]$SelectedEdition)
 						Write-Host "=============================================================================="
 					}
 					if ($r.Errors) {
+						if ($attempt++ -le 1) { continue }
 						throw $r.Errors[0].Value
 					}
 					foreach ($Sku in $r.Skus) {
@@ -687,8 +698,11 @@ function Get-Windows-Languages([int]$SelectedVersion, [object]$SelectedEdition)
 						$languages[$Sku.Language].Data += @{ SessionIndex = $SessionIndex; SkuId = $Sku.Id }
 					}
 					if ($languages.Length -eq 0) {
+						if ($attempt++ -le 1) { continue }
 						throw "Could not parse languages"
 					}
+					break;
+				}
 			} catch {
 				Error($_.Exception.Message)
 				return @()
@@ -1142,8 +1156,8 @@ exit $ExitCode
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@@ -1245,23 +1259,23 @@ exit $ExitCode
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@@ -1368,19 +1382,19 @@ exit $ExitCode
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 # SIG # End signature block