await Task.WhenAll(tasks); // Merge parts...
const int chunkSize = 8 * 1024 * 1024; // 8 MB using var client = new HttpClient(); var response = await client.SendAsync(new HttpRequestMessage(HttpMethod.Head, url)); long totalSize = long.Parse(response.Content.Headers.GetValues("Content-Length").First()); huawei flasher v2 download better
int chunkCount = (int)Math.Ceiling((double)totalSize / chunkSize); var tasks = new Task[chunkCount]; await Task