diff --git a/API/Controllers/KoreaderController.cs b/API/Controllers/KoreaderController.cs
index 895419629..1ce5e3202 100644
--- a/API/Controllers/KoreaderController.cs
+++ b/API/Controllers/KoreaderController.cs
@@ -81,7 +81,12 @@ public class KoreaderController : BaseApiController
         }
     }
 
-
+    /// <summary>
+    /// Gets book progress from Kavita, if not found will return a 400
+    /// </summary>
+    /// <param name="apiKey"></param>
+    /// <param name="ebookHash"></param>
+    /// <returns></returns>
     [HttpGet("{apiKey}/syncs/progress/{ebookHash}")]
     public async Task<ActionResult<KoreaderBookDto>> GetProgress(string apiKey, string ebookHash)
     {
diff --git a/API/DTOs/Koreader/KoreaderProgressUpdateDto.cs b/API/DTOs/Koreader/KoreaderProgressUpdateDto.cs
index 6472cda10..52a1d6cbd 100644
--- a/API/DTOs/Koreader/KoreaderProgressUpdateDto.cs
+++ b/API/DTOs/Koreader/KoreaderProgressUpdateDto.cs
@@ -4,6 +4,12 @@ namespace API.DTOs.Koreader;
 
 public class KoreaderProgressUpdateDto
 {
+    /// <summary>
+    /// This is the Koreader hash of the book. It is used to identify the book.
+    /// </summary>
     public string Document { get; set; }
+    /// <summary>
+    /// UTC Timestamp to return to KOReader
+    /// </summary>
     public DateTime Timestamp { get; set; }
 }
diff --git a/API/Data/Repositories/MangaFileRepository.cs b/API/Data/Repositories/MangaFileRepository.cs
index 5c6aae0c8..32a8bfc34 100644
--- a/API/Data/Repositories/MangaFileRepository.cs
+++ b/API/Data/Repositories/MangaFileRepository.cs
@@ -40,6 +40,6 @@ public class MangaFileRepository : IMangaFileRepository
 
         return await _context.MangaFile
             .FirstOrDefaultAsync(f => f.KoreaderHash != null &&
-                                      EF.Functions.Like(f.KoreaderHash, hash));
+                                    f.KoreaderHash.Equals(hash.ToUpper()));
     }
 }
diff --git a/API/Helpers/Builders/KoreaderBookDtoBuilder.cs b/API/Helpers/Builders/KoreaderBookDtoBuilder.cs
index fd701b5e2..5a5834adb 100644
--- a/API/Helpers/Builders/KoreaderBookDtoBuilder.cs
+++ b/API/Helpers/Builders/KoreaderBookDtoBuilder.cs
@@ -38,8 +38,7 @@ public class KoreaderBookDtoBuilder : IEntityBuilder<KoreaderBookDto>
 
     public KoreaderBookDtoBuilder WithDeviceId(string installId, int userId)
     {
-        using var sha256 = SHA256.Create();
-        var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(installId + userId));
+        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(installId + userId));
         _dto.Device_id = hash.ToString();
         return this;
     }
diff --git a/API/Services/KoreaderService.cs b/API/Services/KoreaderService.cs
index a460cff14..69b3948ed 100644
--- a/API/Services/KoreaderService.cs
+++ b/API/Services/KoreaderService.cs
@@ -74,7 +74,6 @@ public class KoreaderService : IKoreaderService
     public async Task<KoreaderBookDto> GetProgress(string bookHash, int userId)
     {
         var settingsDto = await _unitOfWork.SettingsRepository.GetSettingsDtoAsync();
-        var builder = new KoreaderBookDtoBuilder(bookHash);
 
         var file = await _unitOfWork.MangaFileRepository.GetByKoreaderHash(bookHash);
 
@@ -83,7 +82,7 @@ public class KoreaderService : IKoreaderService
         var progressDto = await _unitOfWork.AppUserProgressRepository.GetUserProgressDtoAsync(file.ChapterId, userId);
         var koreaderProgress = KoreaderHelper.GetKoreaderPosition(progressDto);
 
-        return builder.WithProgress(koreaderProgress)
+        return new KoreaderBookDtoBuilder(bookHash).WithProgress(koreaderProgress)
             .WithPercentage(progressDto?.PageNum, file.Pages)
             .WithDeviceId(settingsDto.InstallId, userId)
             .Build();